Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911 / Water Purification Plant, Washington, D. C. Results of Operation.

by American Society of Civil Engineers; E. D. Hardy

The layer of clean sand restored the original capacity, and the filter was operated as before, but with gradually decreasing rates until December, 1908, when the rate was reduced to about 40,000,000 gal. Even this lower rate was too high to be maintained without removing and replacing a large part of the sand. The rates, therefore, gradually decreased to about 23,000,000 gal. on March 13th, 1909, when the filter was again re‑sanded. After this re‑sanding the rate was reduced to about 20,000,000 gal., and the filter was operated at approximately that rate until it was again re‑sanded on November 13th, 1909, when the rate was again reduced to about 14,000,000 gal., which was maintained until the filter was put out of service on February 28th, 1910.

This experimental plant was in service from September, 1908, to the latter part of February, 1910, or for about 1‑1/2 years, and the leading results are summarized in [Table 20.]

Table 17—Record of Experimental Filter Plant No. 1.

Date.	Preliminary Filter.		Final Filter.		Turbidity.			Bacteria.
	Rate, millions of gallons per acre daily.	Loss of head.	Rate, millions of gallons per acre daily.	Loss of head.	Applied water.	Effluent preliminary filter.	Effluent final filter.	Applied water.	Effluent preliminary filter.	Effluent final filter.
1907.
Feb. 8	19.40	0.71	3.10	0.17	...	...	...	1,100	2,000	2,500
Feb. 9	21.50	0.81	3.11	0.16	...	...	...	200	950	500
Feb. 10	20.60	0.95	3.04	0.14	...	...	...	...	...	...
Feb. 11	20.10	1.08	3.03	0.12	12	3	2	600	900	1,300
Feb. 12	19.80	1.23	3.02	0.13	14	4	2	650	650	650
Feb. 13	19.50	1.38	2.96	0.12	15	6	2	600	600	950
Feb. 14	21.20	1.67	3.21	0.11	15	4	2	650	700	800
Feb. 15	25.40	2.03	3.90	0.13	12	4	2	600	550	800
Feb. 16	25.00	2.23	3.89	0.12	14	3	2	850	550	500
Feb. 17	Shut down for changes in size of meter and piping.
Feb. 18	...	...	...	...	...	...	...	1,200	...	650
Feb. 21	38.60	1.59	3.93	0.18	20	4	2	1,800	1,100	700
Feb. 22	38.00	1.84	3.92	0.15	15	3	2	Holiday.
Feb. 23	42.10	2.36	3.95	0.14	20	5	2	1,600	600	220
Feb. 24	47.90	3.04	3.93	0.13	20	6	3	Sunday.
Feb. 25	Shut down change meter from outlet to inlet.							1,400	800	450
Feb. 27	...	2.24	...	0.13	17	6	3	700	550	280
Feb. 28	49.80	2.55	3.90	0.13	15	6	3	800	470	230
Mar. 1	50.00	2.90	3.93	0.13	15	5	3	650	450	140
Mar. 2	50.20	3.21	3.93	0.13	15	5	3	1,000	650	200
Mar. 3	38.80	3.09	3.89	0.13	31	8	3	Sunday.
Mar. 4	50.00	3.54	3.93	0.12	35	10	5	1,200	...	...
Mar. 5	50.00	4.01	3.90	0.13	135	39	8	13,000	3,700	600
Mar. 6	50.00	4.82	3.90	0.13	135	39	8	18,000	4,500	...
Mar. 7	50.00	5.89	3.90	0.13	102	34	6	24,000	5,000	2,000
Mar. 8	50.00	6.58	3.90	0.13	100	25	4	22,000	5,000	1,400
Mar. 9	50.00	7.21	3.93	0.13	90	25	4	24,000	4,000	650
Mar. 10	50.00	7.52	3.90	0.13	82	22	5	Sunday.
	Washed.
Mar. 11	50.00	0.84	3.90	0.13	68	19	6	18,000	2,100	350
Mar. 12	50.00	0.95	3.96	0.13	46	19	4	11,000	6,000	310
Mar. 13	50.00	1.17	3.99	0.13	40	19	4	9,000	4,900	300
Mar. 14	50.00	1.53	4.01	0.13	39	17	4	5,500	1,300	130
Mar. 15	50.00	2.27	4.05	0.13	35	15	4	6,500	1,500	60
Mar. 16	50.00	3.08	4.03	0.13	60	20	4	5,000	1,200	100
Mar. 17	50.00	4.26	4.03	0.13	135	35	4	Sunday.
Mar. 18	50.00	5.65	4.00	0.13	170	49	7	9,000	1,200	95
Mar. 19	50.00	7.02	4.01	0.13	125	37	6	7,000	600	100
	Washed.
Mar. 20	50.00	1.08	3.98	0.13	102	30	5	4,800	300	75
Mar. 21	50.00	1.23	3.98	0.12	125	32	4	8,500	1,000	85
Mar. 22	50.00	1.46	4.00	0.13	190	65	4	7,500	1,100	45
Mar. 23	50.00	1.76	3.99	0.13	180	65	6	7,500	600	55
Mar. 24	50.00	2.11	3.99	0.12	140	52	7	Sunday.
Mar. 25	50.00	2.46	4.00	0.11	88	30	5	4,400	500	85
Mar. 26	50.00	2.75	4.00	0.12	62	22	4	3,600	300	65
Mar. 27	50.00	3.04	4.08	0.13	47	18	4	2,200	160	60
Mar. 28	50.00	3.38	3.94	0.11	35	10	3	1,300	100	55
Mar. 29	50.00	3.70	4.00	0.11	26	8	3	700	80	29
Mar. 30	50.00	4.42	4.00	0.11	25	6	3	310	70	35
Mar. 31	50.00	5.25	3.99	0.11	21	5	2	Sunday.
Apr. 1	50.00	6.14	4.00	0.12	20	5	2	600	25	30
	Washed.
Apr. 2	50.00	2.10	4.00	0.12	24	5	2	270	28	32
Apr. 3	50.00	3.00	4.00	0.12	24	5	2	460	26	43
Apr. 4	50.00	4.01	4.00	0.12	20	5	2	280	20	26
Apr. 5	50.00	5.15	4.00	0.12	20	4	2	450	37	41
	Washed.
Apr. 6	50.00	O.76	3.59	0.12	20	4	2	320	6	34
Apr. 7	50.00	O.99	3.47	0.12	20	4	2	Sunday.
Apr. 8	50.00	1.39	4.03	0.14	18	3	2	330	10	20
Apr. 9	50.00	2.04	4.01	0.13	18	3	2	140	9	35
Apr. 10	50.00	3.03	4.02	0.13	30	2	1	750	43	29
Apr. 11	50.00	4.45	4.02	0.14	66	1	1	4,000	900	26
Apr. 12	50.00	6.14	4.01	0.13	72	11	2	14,000	1700	41
	Washed.
Apr. 13	50.00	0.95	4.00	0.14	80	21	2	13,000	1300	70
Apr. 14	50.00	1.18	4.00	0.13	77	25	3	Sunday.
Apr. 15	50.00	1.57	4.00	0.14	62	21	3	7,000	380	55
Apr. 16	50.00	2.33	4.00	0.15	47	20	3	3,600	160	33
Apr. 17	50.00	3.33	4.00	0.15	39	15	2	1,600	70	39
Apr. 18	50.00	4.81	4.00	0.16	30	10	2	1,810	130	34
Apr. 19	50.00	6.29	3.99	0.16	25	7	2	790	50	32
	Washed.
Apr. 20	50.00	0.93	4.01	0.16	20	5	2	540	24	28
Apr. 21	50.00	1.36	3.97	0.16	20	3	2	Sunday.
Apr. 22	50.00	2.22	4.02	0.16	18	2	1	235	15	28
Apr. 23	50.00	3.33	3.99	0.14	15	2	1	170	14	16
Apr. 24	50.00	4.78	3.97	0.15	19	1	1	150	32	14
Apr. 25	50.00	6.43	3.90	0.15	34	1	1	700	20	18
	Washed.
Apr. 26	50.00	O.97	3.97	0.14	46	2	1	1,200	16	16
Apr. 27	50.00	2.37	4.00	0.14	52	3	1	1,700	25	17
Apr. 28	50.00	5.33	3.99	0.14	45	4	1	Sunday.
	Washed.
Apr. 29	50.00	0.81	3.99	0.14	44	5	1	600	16	17
Apr. 30	50.00	1.75	3.99	0.14	39	6	1	550	27	12
May 1	50.00	0.80	3.99	0.14	31	5	1	500	24	11
	Washed.
May 2	50.00	1.13	4.00	0.14	24	4	1	500	12	16
May 3	50.00	2.09	4.00	0.14	19	3	1	280	30	25
May 4	50.00	3.80	4.00	0.14	16	2	1	400	20	12
May 5	50.00	5.38	4.00	0.14	15	1	1	Sunday.
	Washed.
May 6	50.00	0.91	3.90	0.14	13	1	1	390	50	40
May 7	50.00	1.56	3.90	0.14	12	1	1	190	19	80
May 8	50.00	2.25	3.99	0.14	10	1	1	...	...	...
May 9	50.00	3.37	4.00	0.14	10	1	1	390	21	38
May 10	50.00	5.16	4.00	0.14	10	1	1	300	14	13
	Washed.
May 11	50.00	1.03	4.00	0.14	12	1	1	390	13	12
May 12	50.00	1.89	4.00	0.14	17	1	1	Sunday.
May 13	50.00	3.82	4.00	0.14	35	2	1	600	33	15
May 14	50.00	6.31	4.00	0.14	39	3	1	500	27	7
	Washed.
May 15	50.00	0.85	4.00	0.14	17	2	1	500	20	29
May 16	50.00	1.42	3.99	0.14	24	2	1	290	19	40
May 17	50.00	2.47	3.99	0.14	18	2	1	260	19	16
May 18	50.00	4.31	4.00	0.13	15	1	1	190	16	20
	Washed.
May 19	50.00	0.83	3.99	0.13	12	1	1	Sunday.
May 20	50.00	1.66	4.00	0.13	12	1	1	260	17	41
May 21	50.00	3.83	4.00	0.13	16	1	1	260	26	25
	Washed.
May 22	50.00	0.82	3.99	0.13	20	1	1	280	16	19
May 23	50.00	1.64	4.00	0.13	15	1	1	130	20	22
May 24	50.00	3.85	4.00	0.13	15	1	1	170	17	32
	Washed.
May 25	50.00	0.84	4.00	0.13	15	1	1	340	25	55
May 26	50.00	1.67	3.99	0.13	18	1	1	Sunday.
May 27	50.00	3.03	4.00	0.13	13	1	1	210	10	40
	Washed.
May 28	50.00	0.87	4.01	0.13	16	1	1	260	26	55
May 29	50.00	1.43	4.01	0.13	16	1	1	500	19	50
May 30	50.00	2.55	4.00	0.13	14	1	1	Holiday.
May 31	50.00	4.19	4.00	0.13	17	1	1	380	22	50
June 1	50.00	6.26	3.99	0.13	15	1	1	900	27	50
	Washed.
June 2	50.00	0.78	3.98	0.13	17	1	1	Sunday.
June 3	50.00	1.19	4.00	0.13	24	1	1	550	41	50
June 4	50.00	2.15	4.00	0.13	37	2	1	6,500	150	60
June 5	50.00	3.67	4.01	0.13	65	4	1	3,200	150	46
June 6	50.00	6.06	4.00	0.14	77	12	1	1,500	60	27
	Washed.
June 7	50.00	0.86	4.00	0.14	64	19	1	2,100	68	45
June 8	50.00	1.41	4.00	0.14	46	16	1	600	35	44
June 9	50.00	2.62	4.01	0.14	44	12	1	Sunday.
June 10	50.00	4.79	4.00	0.14	36	8	1	240	31	35
	Washed.
June 11	50.00	0.77	4.00	0.14	30	6	1	280	47	47
June 12	50.00	1.20	4.01	0.14	34	6	1	330	70	55
June 13	50.00	2.42	4.00	0.14	35	8	1	480	43	75
June 14	50.00	4.44	4.00	0.15	31	7	1	440	55	45
	Washed.
June 15	50.00	0.80	3.99	0.15	32	6	1	420	17	34
June 16	50.00	1.15	4.00	0.15	26	5	1	Sunday.
June 17	50.00	2.15	3.99	0.14	26	5	1	340	55	37
June 18	50.00	4.36	4.00	0.14	31	6	1	440	14	140
	Washed.
June 19	50.00	0.79	4.01	0.15	37	8	1	500	70	24
June 20	50.00	1.19	4.00	0.15	30	7	1	330	49	27
June 21	50.00	2.65	3.98	0.14	25	5	1	170	30	18
June 22	50.00	5.58	4.00	0.14	20	4	1	100	18	13
	Washed.
June 23	50.00	0.85	3.62	0.13	26	3	1	Sunday.
June 24	50.00	2.02	3.99	0.13	140	11	1	1,700	27	36
June 25	50.00	4.77	3.99	0.13	130	26	1	400	70	23
	Washed.
June 26	50.00	0.73	4.01	0.13	82	27	1	750	200	41
June 27	50.00	1.17	4.01	0.13	65	18	1	...	...	...
June 28	50.00	3.10	3.99	0.13	47	16	1	...	20	...
	Washed.
June 29	50.00	0.67	3.99	0.13	37	7	1	220	35	29
June 30	50.00	1.02	4.00	0.13	30	6	1	Sunday.
July 1	50.00	2.70	3.99	0.13	30	6	1	400	46	3
	Washed.
July 2	50.00	0.69	4.00	0.13	32	7	1	180	80	38
July 3	50.00	1.21	3.99	0.13	36	8	1	350	70	90
July 4	50.00	3.40	3.99	0.13	44	10	1	Holiday.
	Washed.
July 5	50.00	0.77	3.99	0.13	44	11	1	550	180	34
July 6	50.00	1.19	4.01	0.13	39	10	1	250	60	26
July 7	50.00	3.72	3.99	0.13	34	8	1	Sunday.
	Washed.
July 8	50.00	0.78	3.97	0.13	25	5	1	220	31	21
July 9	50.00	1.27	3.98	0.13	22	4	1	50	10	9
July 10	50.00	3.11	4.09	0.13	47	9	1	Lost.
	Washed.
July 11	50.00	0.83	3.99	0.13	90	19	1	150	19	8
July 12	50.00	1.47	3.99	0.13	97	25	1	300	40	23
July 13	50.00	3.61	4.00	0.13	96	29	1	220	47	16
	Washed.
July 14	50.00	0.84	3.99	0.13	90	30	1	Sunday.
July 15	50.00	1.30	4.00	0.13	95	30	1	375	55	21
July 16	50.00	2.72	3.99	0.14	120	35	1	Lost.	90	13
July 17	50.00	5.08	3.99	0.14	85	32	1	270	2	11
	Washed.
July 18	50.00	0.85	3.99	0.14	56	22	1	1,675	70	50
July 19	50.00	1.43	4.00	0.14	41	12	1	450	95	22
July 20	50.00	3.23	3.99	0.14	62	19	1	300	38	11
	Washed.
July 21	50.00	0.80	3.99	0.14	62	21	1	Sunday.
July 22	50.00	1.06	3.98	0.14	80	26	1	1,400	150	7
July 23	50.00	2.18	3.99	0.14	105	30	1	3,700	Lost.	11
July 24	50.00	4.95	3.98	0.15	95	30	1	770	Lost.	22
	Washed.
July 25	50.00	0.84	3.98	0.15	77	22	1	250	33	11
July 26	50.00	1.22	3.98	0.15	67	19	1	140	100	4
July 27	50.00	2.36	4.00	0.16	54	15	1	300	95	7
July 28	50.00	4.74	3.98	0.16	46	12	1	Sunday.
	Washed.
July 29	50.00	0.83	3.99	0.17	36	10	1	470	110	18
July 30	50.00	1.02	4.00	0.17	29	7	1	Plates lost.
July 31	50.00	1.66	4.00	0.17	21	5	1	Plates lost.
Aug. 1	48.20	2.95	4.00	0.17	16	4	1	Plateslost.
Aug. 2	46.40	4.96	4.00	0.17	15	2	1	130	42	13
	Washed.
Aug. 3	42.60	0.79	4.00	0.17	16	1	1	120	4	16
Aug. 4	49.10	0.91	4.00	0.17	21	1	1	Sunday.
Aug. 5	49.10	1.59	4.00	0.17	29	1	1	230	160	11
Aug. 6	48.20	3.16	4.00	0.17	34	2	1	85	200	12
Aug. 7	45.60	5.65	3.99	0.17	21	2	1	200	Lost	4
	Washed.
Aug. 8	50.00	0.80	3.99	0.17	19	2	1	100	70	11
Aug. 9	49.10	0.94	4.00	0.17	16	1	1	75	44	9
Aug. 10	48.20	1.51	4.00	0.17	24	1	1	60	13	6
Aug. 11	48.20	3.32	4.00	0.17	62	3	1	Sunday.
	Washed.
Aug. 12	41.90	0.83	3.99	0.17	120	14	1	620	110	5
Aug. 13	49.10	1.14	3.99	0.17	107	29	1	820	53	36
Aug. 14	49.10	1.72	4.00	0.18	82	30	1	850	160	110
Aug. 15	48.20	3.30	4.00	0.18	65	22	1	150	37	4
Aug. 16	46.40	0.84	4.00	0.19	45	15	1	270	110	13
Aug. 17	48.20	1.05	4.00	0.19	35	10	1	340	110	6
Aug. 18	50.00	1.54	4.00	0.19	21	5	1	Sunday.
Aug. 19	49.10	2.29	4.00	0.19	18	4	1	180	85	13
Aug. 20	49.10	3.74	3.99	0.19	20	2	1	210	85	8
	Washed.
Aug. 21	44.10	1.01	3.98	0.19	20	2	1	1300	115	9
Aug. 22	45.60	1.86	4.00	0.19	27	2	1	3800	265	1
Aug. 23	47.30	4.08	3.99	0.19	49	2	1	2500	70	13
	Washed.
Aug. 24	41.30	1.29	3.97	0.19	36	6	1	3900	46	6
Aug. 25	44.10	2.11	3.98	0.20	34	7	1	Sunday.
Aug. 26	48.20	3.42	3.99	0.20	21	5	1	700	140	0
Aug. 27	48.20	5.10	4.00	0.20	19	4	1	470	100	4
	Washed.
Aug. 28	46.40	1.28	4.00	0.20	18	3	1	500	49	3
Aug. 29	41.90	1.90	4.02	0.20	17	2	1	360	80	0
Aug. 30	45.60	3.23	4.00	0.20	15	1	1	320	190	1
Aug. 31	46.40	4.57	4.00	0.20	13	1	1	200	20	3
Sept. 1	50.00	5.17	3.65	0.20	14	1	1	Sunday.
Sept. 2	48.20	5.97	4.00	0.20	12	1	1	Holiday.
	Washed.
Sept. 3	47.30	1.13	4.00	0.20	12	1	1	300	9	1
Sept. 4	48.20	2.01	4.00	0.20	16	1	1	600	60	2
Sept. 5	46.40	5.41	3.67	0.20	34	1	0	360	72	...
	Washed.
Sept. 6	40.60	1.42	3.98	0.20	160	12	0	15000	140	0
Sept. 7	42.60	5.19	3.99	0.20	64	18	1	2000	130	1
	Washed.
Sept. 8	42.60	1.25	4.00	0.20	56	18	1	Sunday.
Sept. 9	46.40	3.07	4.00	0.22	59	18	1	220	80	4
	Washed.
Sept. 10	45.60	1.02	3.99	0.23	57	16	1	18000	57	8
Sept. 11	48.20	2.36	4.00	0.23	65	18	1	2700	90	1
	Washed.
Sept. 12	44.10	1.14	3.99	0.24	72	18	1	1000	47	4
Sept. 13	46.40	3.61	3.99	0.25	87	20	1	2300	77	5
	Washed.
Sept. 14	38.20	1.42	3.97	0.26	72	19	1	2400	80	5
Sept. 15	45.60	4.27	4.00	0.27	65	18	1	Sunday.
	Washed.
Sept. 16	40.00	1.06	3.99	0.28	65	18	1	Lost.	22	Lost.
Sept. 17	46.40	2.48	4.01	0.28	52	16	1	420	75	1
	Washed.
Sept. 18	46.40	1.11	4.00	0.28	60	13	1	900	37	3
Sept. 19	46.40	2.76	4.00	0.28	85	16	1	2000	186	0
	Washed.
Sept. 20	44.10	1.12	4.00	0.31	100	19	1	4200	110	7
Sept. 21	48.20	2.07	3.99	0.33	120	24	1	1100	110	3
	Washed.
Sept. 22	44.10	1.30	3.67	0.34	137	29	1	Sunday.
Sept. 23	45.60	3.79	3.99	0.39	112	25	1	2400	50	2
	Washed.
Sept. 24	45.60	1.15	3.97	0.40	100	25	1	4000	69	4
Sept. 25	48.20	2.06	4.00	0.42	432	53	1	56000	680	0
Sept. 26	Stopped, unable to wash preliminary.
Sept. 28	50.00	1.74	4.00	0.71	127	35	1	...	...	37
	Washed.
Sept. 29	44.10	2.85	3.99	0.82	105	31	1	Sunday.
Sept. 30	44.90	3.78	3.97	1.04	115	32	1	Lost.	Lost.	160
	Washed.
Oct. 1	44.10	1.20	3.98	1.34	82	26	1	600	180	55
Oct. 2	49.10	3.22	3.97	1.54	65	19	1	4,400	120	5
	Washed.
Oct. 3	44.10	1.31	3.97	1.56	59	17	1	900	55	10
Oct. 4	49.10	2.97	3.97	1.65	55	15	1	850	60	6
	Washed.
Oct. 5	44.90	1.31	3.98	1.75	59	16	1	2,000	110	38
Oct. 6	46.40	3.65	3.99	1.89	59	17	1	Sunday.
	Washed.
Oct. 7	44.90	1.34	3.98	1.99	52	13	1	1,250	70	15
Oct. 8	49.10	3.49	3.98	2.17	54	13	1	11,000	65	6
	Washed.
Oct. 9	44.10	1.20	3.97	2.33	51	13	1	2,000	85	4
Oct. 10	49.10	2.22	3.98	2.55	50	12	1	800	36	10
Oct. 11	46.40	4.59	4.00	2.51	47	11	1	2,000	57	10
Oct. 12	Shut off to remove sand in preliminary filter in order to clean out the under-drains.
Nov. 5	50.00	1.38	3.97	3.49	185	50	1	...	...	...
Nov. 6	48.20	3.25	3.98	3.79	170	52	1	5,000	1,500	240
	Washed.
Nov. 7	45.60	1.18	3.98	4.05	100	35	1	14,000	1,000	220
Nov. 8	48.20	4.08	3.99	4.37	95	32	1	1,900	270	160
Nov. 9	42.00	6.58	3.98	4.39	80	27	1	4,000	500	190
Nov. 10	Shut down for scraping. Removed 266,000 cu. cm. of sand.
Nov. 12	50.00	0.98	3.99	0.25	40	10	1	...	...	...
Nov. 13	50.00	1.51	4.00	0.22	36	8	1	1,600	750	85
Nov. 14	48.20	2.60	4.00	0.21	42	11	1	2,700	700	210
Nov. 15	47.30	3.80	4.00	0.20	35	9	1	1,800	350	180
Nov. 16	47.30	4.87	4.00	0.19	26	5	1	1,100	200	34
Nov. 17	50.00	5.75	4.00	0.19	20	4	1	Sunday.
Nov. 18	50.00	6.41	4.00	0.19	17	3	1	1,600	290	55
	Washed.
Nov. 19	48.20	1.06	3.99	0.20	16	2	1	1,300	480	60
Nov. 20	48.20	2.05	3.99	0.20	45	3	1	6,500	3,700	800
Nov. 21	48.20	3.48	3.99	0.20	52	9	1	9,900	4,000	300
Nov. 22	47.30	4.85	3.99	0.20	65	17	1	10,000	1,000	380
Nov. 23	48.20	6.11	3.99	0.20	49	15	1	18,000	1,000	320
	Washed.
Nov. 24	46.40	3.71	3.98	0.20	134	24	1	Sunday.
Nov. 25	Shut down for fear of washing preliminary with such muddy water.
Nov. 29	50.00	1.55	4.00	0.21	80	25	1	...	...	...
Nov. 30	47.30	3.14	3.98	0.22	54	16	1	3,800	950	160
Dec. 1	47.30	4.48	3.98	0.23	37	10	1	Sunday.
Dec. 2	47.30	5.63	3.98	0.25	36	6	1	2,900	550	90
	Washed.
Dec. 3	46.40	0.98	3.99	0.25	29	6	1	2,900	480	75
Dec. 4	50.00	1.15	3.99	0.26	20	4	1	2,000	270	70
Dec. 5	50.00	1.48	4.00	0.25	18	3	1	1,100	270	50
Dec. 6	48.20	2.04	3.63	0.25	16	2	1	3,000	...	...
Dec. 7	48.20	2.80	4.00	0.26	14	1	1	2,400	190	10
Dec. 8	50.00	3.40	3.72	0.27	12	1	1	Sunday.
Dec. 9	49.10	3.93	4.00	0.27	11	1	1	1,200	170	7
Dec. 10	49.10	4.50	4.00	0.27	12	1	1	800	90	55
Dec. 11	48.20	5.52	4.00	0.27	255	44	1	6,500	---	---
Dec. 12	Shut down 12/11 at 6 P.M. turbidity too high to wash.
Dec. 15	---	---	---	---	---	---	---	Sunday.
Dec. 16	50.00	4.02	3.99	0.28	90	35	2	---	---	---
	Washed.
Dec. 17	40.00	1.90	3.97	0.30	70	25	2	21,000	10,000	1,200
	Washed.
Dec. 18	44.10	1.08	3.97	0.31	49	15	2	6,500	4,200	800
Dec. 19	48.20	1.88	3.98	0.31	39	10	1	Lost.	Lost.	Lost.
Dec. 20	46.40	4.77	3.99	0.31	42	13	1	Lost.	Lost.	Lost.
Dec. 21	46.40	6.68	3.99	0.32	26	6	1	Lost.	Lost.	Lost.
	Washed.
Dec. 22	49.10	1.14	3.99	0.32	20	4	1	Sunday.
Dec. 23	49.10	2.17	4.00	0.31	34	7	1	1,400	300	100
Dec. 24	49.10	3.76	4.00	0.31	195	56	1	9,000	950	70
Dec. 25	Shut down 12/24 at 9 P.M. turbidity too high to wash. Holiday.
Dec. 30	50.00	2.61	3.97	0.33	56	19	2	---	---	---
Dec. 31	44.80	5.57	3.98	0.36	39	12	1	---	---	---
	Washed.
1908.
Jan. 1	46.40	1.30	3.98	0.36	31	6	1	Holiday.
Jan. 2	48.20	3.36	4.00	0.36	39	9	1	---	---	---
Jan. 3	47.30	4.95	3.99	0.35	36	9	1	3,100	490	90
Jan. 4	50.00	5.28	3.99	0.35	32	7	1	2,400	240	43
Jan. 5	49.10	6.26	4.00	0.35	26	5	1	Sunday.
	Washed.
Jan. 6	49.10	0.99	3.98	0.35	20	4	1	600	200	37
Jan. 7	50.00	1.15	4.00	0.35	20	4	1	1,100	150	47
Jan. 8	50.00	1.41	4.00	0.35	22	4	1	1,900	160	30
Jan. 9	49.10	1.92	4.00	0.35	45	11	1	13,000	1,300	70
Jan. 10	49.10	2.56	4.00	0.36	70	25	1	10,000	3,500	170
Jan. 11	50.00	3.17	3.99	0.37	56	18	1	16,000	4,000	240
Jan. 12	49.10	3.73	4.00	0.37	40	10	1	Sunday.
Jan. 13	50.00	4.14	4.00	0.37	110	45	2	8,500	1,200	840
Jan. 14	49.10	4.65	3.99	0.38	210	95	3	16,000	3,900	500
Jan. 15	49.10	5.23	3.99	0.41	325	190	12	24,000	7,000	550
Jan. 16	50.00	5.75	3.99	0.43	360	210	37	28,000	8,500	1,200
Jan. 17	49.10	6.34	4.00	0.45	242	122	24	65,000	15,000	1,700
Jan. 18	---	---	---	---	---	---	---	---	---	---
Jan. 19	50.00	1.17	4.00	0.46	117	40	12	Sunday.
Jan. 20	50.00	1.38	4.00	0.46	72	31	6	1,600	1,800	320
Jan. 21	50.00	1.68	3.57	0.37	55	20	4	5,000	450
Jan. 22	49.10	2.04	4.00	0.44	49	17	3	3,600	600	100
Jan. 23	50.00	2.47	3.24	0.33	40	12	3	1,800	290	130
Jan. 24	49.10	3.03	3.00	0.34	40	11	2	2,300	270	65
Jan. 25	50.00	3.61	3.00	0.35	39	10	2	1,100	180	60
Jan. 26	49.10	4.18	2.99	0.35	32	7	2	Sunday.
Jan. 27	50.00	4.81	3.00	0.35	32	7	2	300	40	24
Jan. 28	48.20	5.45	2.99	0.35	45	12	2	1,200	90	31
Jan. 29	49.10	6.01	2.99	0.35	60	21	2	1,000	230	50
Jan. 30	49.10	6.62	2.99	0.36	57	22	2	1,400	170	48
	Washed.
Jan. 31	50.00	1.30	2.99	0.36	42	15	2	1,100	190	23
Feb. 1	50.00	1.51	2.99	0.37	39	11	2	750	40	31
Feb. 2	50.00	1.78	3.00	0.37	27	7	2	Sunday.
Feb. 3	49.10	2.13	3.00	0.37	29	6	2	1,300	200	7
Feb. 4	50.00	2.69	3.00	0.37	25	5	1	600	160	18
Feb. 5	49.10	3.31	2.99	0.37	24	5	1	750	140	41
Feb. 6	50.00	3.89	2.99	0.37	20	4	1	2,000	180	29
Feb. 7	48.20	4.50	2.99	0.37	17	3	1	...	38	15
Feb. 8	49.10	5.11	2.99	0.37	15	3	1	900	95	24
Feb. 9	49.10	5.65	3.00	0.38	14	3	1	Sunday.
Feb. 10	49.10	6.43	2.99	0.38	11	3	1	850	85	21
Feb. 11	50.00	6.90	3.00	0.38	10	3	1	1,000	70	20
	Washed.
Feb. 12	49.10	1.29	2.99	0.38	8	2	1	750	20	16
Feb. 13	50.00	1.50	2.99	0.39	9	2	1	700	40	11
Feb. 14	50.00	1.80	2.99	0.39	9	2	1	1,200	39	7
Feb. 15	49.10	2.35	3.00	0.39	61	13	1	5,500	600	7
Feb. 16	49.10	3.28	2.99	0.39	80	30	2	Sunday.
Feb. 17	48.20	4.85	2.99	0.39	80	29	3	33,000	3,800	130
Feb. 18	47.30	6.39	2.99	0.39	130	44	3	---	2,600	160
Feb. 19	45.50	7.32	2.98	0.40	320	143	6	28,000	6,000	180
	Washed.
Feb. 22	50.00	1.40	3.00	0.41	85	30	5	Holiday.
Feb. 23	50.00	1.77	3.00	0.41	60	21	4	Sunday.
Feb. 24	49.10	2.25	2.99	0.41	46	14	3	3,600	2,800	90
Feb. 25	50.00	2.61	3.00	0.41	31	7	2	2,300	140	47
Feb. 26	50.00	3.06	3.00	0.41	30	6	2	3,800	140	45
Feb. 27	48.20	3.65	2.99	0.41	30	5	1	1,300	100	22
Feb. 28	50.00	4.24	3.00	0.41	37	6	1	1,400	100	40
Feb. 29	48.20	5.28	2.99	0.41	123	52	2	13,500	420	40
	Washed.
Mar. 1	44.60	1.56	2.99	0.42	97	39	5	Sunday.
Mar. 2	48.20	2.90	2.99	0.42	82	30	4	8,000	320	60
Mar. 3	46.40	4.69	2.98	0.42	87	33	4	11,000	750	30
Mar. 4	47.30	6.13	2.99	0.42	67	24	3	6,000	290	34
Mar. 5	48.20	7.31	2.99	0.42	59	19	3	4,400	220	41
	Washed.
Mar. 6	49.10	1.53	2.99	0.42	72	24	2	7,000	170	41
Mar. 7	50.00	1.95	3.00	0.43	82	30	2	9,500	210	34
Mar. 8	49.10	2.62	2.99	0.43	92	37	3	Sunday.
Mar. 9	50.00	3.19	3.00	0.43	125	56	4	11,000	700	65
Mar. 10	Preliminary filter discontinued and the Puech system started.

Table 17—Record of Experimental Filter, Puech system.—(Continued.)

Date.	Puech system:					Final filter.		Turbidity.			Bacteria.
	Rates, millions of gallons per acre daily.					Rate, millions of gallons per acre daily.	Loss of head.	Applied water.	Effluent, preliminary filter.	Effluent, final filter.	Applied water.	Effluent, preliminary filter.	Effluent, final filter.
1908.
Mar. 11	265	170	90	53	18	2.99	0.53	155	80	7	6,500	8,500	490
Mar. 12	265	170	90	53	18	2.99	0.60	135	70	7	5,900	6,000	360
Mar. 13	265	170	90	53	18	3.00	0.60	122	52	6	1,900	1,700	140
Mar. 14	265	170	90	53	18	3.00	0.61	97	40	5	1,800	1,600	130
Mar. 15	265	170	90	53	18	2.99	0.64	77	31	4	Sunday.
Mar. 16	265	170	90	53	18	3.00	0.69	65	26	3	1,400	1,200	50
Mar. 17	241	155	82	48	16	2.99	0.71	59	19	3	900	200	45
Mar. 18	252	162	86	50	17	2.99	0.75	67	22	2	1,000	700	33
Mar. 19	241	155	82	48	16	2.99	0.78	60	21	2	...	800	44
Mar. 20	294	189	100	59	20	2.99	0.85	57	18	2	1,300	650	37
Mar. 21	279	179	95	56	19	2.99	0.92	67	21	2	800	600	34
Mar. 22	265	170	90	53	18	2.99	0.99	80	27	2	Sunday.
Mar. 23	265	170	90	53	18	2.99	1.06	90	32	2	4,600	1,300	33
Mar. 24	265	170	90	53	18	2.99	1.12	82	34	3	2,500	950	38
Mar. 25	265	170	90	53	18	2.99	1.18	67	27	3	1,600	...	30
Mar. 26	265	170	90	53	18	2.99	1.22	60	20	3	550	400	24
Mar. 27	265	170	90	53	18	3.00	1.23	59	18	2	950	360	28
Mar. 28	265	170	90	53	18	3.00	1.25	51	14	2	650	230	18
Mar. 29	265	170	90	53	18	2.99	1.28	31	6	2	Sunday.
Mar. 30	265	170	90	53	18	2.99	1.36	30	5	1	500	160	25
Mar. 31	265	170	90	53	18	2.99	1.43	39	7	1	750	140	26
April 1	265	170	90	53	18	3.00	1.48	44	9	1	750	60	41
April 2	265	170	90	53	18	2.99	1.56	42	9	1	1,100	140	26
April 3	318	204	108	64	22	2.99	1.63	41	8	1	1,500	47	11
April 4	294	189	100	59	20	2.99	1.70	54	13	1	700	80	35
April 5	279	179	95	56	19	3.00	1.73	50	13	1	Sunday.
April 6	279	179	95	56	19	2.99	1.76	41	9	1	440	65	17
April 7	265	170	90	53	18	3.00	1.78	35	6	1	650	65	34
April 8	265	170	90	53	18	3.00	1.79	39	6	1	550	44	10
April 9	265	170	90	53	18	3.00	1.79	40	6	1	390	30	25
April 10	265	170	90	53	18	3.00	1.77	40	6	1	500	27	16
April 11	265	170	90	53	18	3.00	1.78	45	7	1	430	28	28
April 12	265	170	90	53	18	2.99	1.80	52	11	1	Sunday.
April 13	265	170	90	53	18	...	1.81	50	10	1	490	17	26
April 14	Shut down on account of losing water when aqueduct was drained; also cleaned coarse sand filter. Started April 22d.
April 23	241	155	82	48	16	...	1.82	29	4	1	140	600	38
April 24	241	155	82	48	16	3.00	1.87	21	3	1	200	1,000	13
April 25	241	155	82	48	16	2.99	1.95	20	3	1	85	180	25
April 26	252	162	86	50	17	3.00	1.95	24	3	1	Sunday.
April 27	241	155	82	48	16	3.00	1.93	18	2	1	95	35	23
April 28	241	155	82	48	16	3.00	1.96	20	2	1	70	24	18
April 29	241	155	82	48	16	2.99	1.97	24	3	1	110	21	24
April 30	241	155	82	48	16	2.99	2.03	21	2	1	70	25	6
May 1	241	155	82	48	16	3.00	2.07	32	4	1	130	20	18
May 2	241	155	82	48	16	2.99	2.12	26	3	1	140	16	12
May 3	241	155	82	48	16	2.99	2.17	22	3	1	Sunday.
May 4	241	155	82	48	16	3.00	2.19	19	2	1	85	30	17
May 5	241	155	82	48	16	3.00	2.20	18	2	1	130	33	9
May 6	241	155	82	48	16	2.99	2.23	18	2	1	230	55	6
May 7	252	162	86	50	17	3.00	2.24	19	2	1	160	75	10
May 8	241	155	82	48	16	3.00	2.25	19	2	1	375	55	8
May 9	318	204	108	64	22	2.99	2.29	18	2	1	1,200	12	9
May 10	318	204	108	64	22	2.99	2.30	30	3	1	Sunday.
May 11	265	170	90	53	18	2.99	2.33	60	10	1	2,800	130	11
May 12	252	162	86	50	17	2.99	2.39	70	15	1	2,900	135	9
May 13	241	155	82	48	16	3.00	2.41	66	14	1	1,800	110	16
May 14	265	170	90	53	18	3.00	2.38	45	7	1	2,700	65	18
May 15	252	162	86	50	17	3.00	2.41	39	5	1	950	45	14
May 16	241	155	82	48	16	3.00	2.41	49	7	1	800	32	10
May 17	241	155	82	48	16	3.01	2.34	46	7	1	Sunday.
May 18	241	155	82	48	16	3.00	2.31	31	4	1	700	26	6
May 19	252	162	86	50	17	3.00	2.26	36	4	1	375	28	17
May 20	252	162	86	50	17	3.00	2.20	41	5	1	425	38	11
May 21	344	221	117	69	23	3.00	2.18	30	3	1	300	25	9
May 22	241	155	82	48	16	3.01	2.17	53	7	1	950	220	18
May 23	265	170	90	53	18	2.99	2.25	127	38	1	2,400	600	21
May 24	331	212	112	66	22	3.00	2.19	110	39	3	Sunday.
May 25	318	204	108	64	22	3.01	2.02	90	25	3	600	300	40
May 26	279	179	95	56	19	3.02	1.87	135	45	3	3,200	110	34
May 27	265	170	90	53	18	3.01	1.63	110	39	3	14,500	320	45
May 28	252	162	86	50	17	3.01	1.41	90	27	3	1,000	95	28
May 29	252	162	86	50	17	3.01	1.24	70	17	3	1,100	150	26
May 30	252	162	86	50	17	3.01	1.07	50	9	2	Holiday.
May 31	241	155	82	48	16	3.01	1.03	34	4	2	Sunday.
June 1	252	162	86	50	17	3.00	0.83	35	4	1	...	...	...
June 2	241	155	82	48	16	3.00	0.74	39	5	1	...	...	...
June 3	252	162	86	50	17	3.00	0.68	35	4	1	...	...	...
June 4	241	155	82	48	16	3.00	0.63	30	3	1	...	...	...
June 5	252	162	86	50	17	2.99	0.60	30	3	1	...	...	...
June 6	241	155	82	48	16	3.00	0.56	27	3	1	...	...	...
June 7	241	155	82	48	16	2.99	0.53	22	2	1	...	...	...
June 8	241	155	82	48	16	3.00	0.49	20	1	1	...	...	...
June 9	241	155	82	48	16	2.99	0.46	20	1	1	...	...	...
June 10	241	155	82	48	16	3.00	0.44	17	1	1	...	...	...
June 11	331	212	112	66	22	2.98	0.42	12	1	1	...	...	...
June 12	318	204	108	64	22	2.98	0.42	11	1	1	...	...	...
June 13	265	170	90	53	18	3.00	0.40	36	3	1	...	...	...
June 14	252	162	86	50	17	2.99	0.40	39	5	1	...	...	...
June 15	241	155	82	48	16	2.99	0.39	25	3	1	...	...	...
June 16	241	155	82	48	16	2.99	0.40	34	3	1	...	...	...
June 17	252	162	86	50	17	2.99	0.41	64	11	1	...	...	...
June 18	241	155	82	48	16	2.99	0.42	57	11	1	...	...	...
June 19	241	155	82	48	16	2.99	0.42	46	8	1	...	...	...
June 20	241	155	82	48	16	2.99	0.42	40	5	1	...	...	...
June 21	241	155	82	48	16	3.00	0.43	28	4	1	...	...	...
June 22	241	155	82	48	16	2.99	0.43	25	3	1	...	...	...
June 23	241	155	82	48	16	2.99	0.43	25	3	1	...	...	...
June 24	241	155	82	48	16	2.99	0.43	29	4	1	...	...	...
June 25	241	155	82	48	16	2.99	0.43	18	2	1	...	...	...
June 26	241	155	82	48	16	2.80	0.42	15	1	1	...	...	...
June 27	241	155	82	48	16	2.99	0.44	12	1	1	...	...	...
June 28	241	155	82	48	16	2.99	0.44	9	1	1	...	...	...
June 29	241	155	82	48	16	2.99	0.44	8	1	1	...	...	...
June 30	241	155	82	48	16	2.99	0.44	10	1	1	...	...	...
July 1	241	155	82	48	16	3.00	0.45	8	1	1	80	10	4
July 2	241	155	82	48	16	3.00	0.46	8	1	0	290	24	5
July 3	241	155	82	48	16	3.00	0.47	8	1	0	350	45	6
July 4	241	155	82	48	16	2.99	0.49	9	1	0	...	...	...
July 5	305	195	103	61	21	3.00	0.51	10	1	0	...	...	...
July 6	241	155	82	48	16	3.00	0.51	9	1	0	300	36	7
July 7	241	155	82	48	16	2.99	0.53	8	1	0	110	10	3
July 8	252	162	86	50	17	3.00	0.53	9	1	0	85	22	2
July 9	241	155	82	48	16	3.00	0.54	8	1	0	85	26	2
July 10	...	...	...	...	...	...	...	...	...	...	200	3	5
July 11	305	195	103	61	21	3.00	0.56	12	1	0	145	7	3
July 12	241	155	82	48	16	2.99	0.58	11	1	0	...	...	...
July 13	241	155	82	48	16	3.00	0.60	10	1	0	115	34	55
July 14	241	155	82	48	16	2.99	0.62	16	1	0	300	55	30
July 15	241	155	82	48	16	2.99	0.64	17	1	0	180	32	23
July 16	241	155	82	48	16	3.00	0.67	13	1	0	100	115	3
July 17	241	155	82	48	16	2.99	0.71	10	1	0	65	275	5
July 18	241	155	82	48	16	2.99	0.73	11	1	0	38	425	10
July 19	241	155	82	48	16	3.00	0.76	12	1	0	...	...	...
July 20	241	155	82	48	16	2.99	0.79	10	1	0	95	90	70
July 21	252	162	86	50	17	2.99	0.83	10	1	1	70	17	4
July 22	241	155	82	48	16	2.99	0.87	13	1	1	440	8	5
July 23	305	195	103	61	21	2.99	0.92	54	4	1	650	26	5
July 24	331	212	111	66	22	2.98	0.99	305	61	1	1,650	...	...
July 25	265	170	90	53	18	2.98	1.08	330	85	1	2,600	115	15
July 26	252	162	86	50	17	2.98	1.21	290	77	2	...	...	...
July 27	305	195	103	61	21	2.98	1.40	335	87	2	35,000	250	...
July 28	252	162	86	50	17	2.98	1.68	170	52	2	1,200	1,350	15
July 29	252	162	86	50	17	2.97	2.14	180	52	2	2,000	600	13
July 30	252	162	86	50	17	2.97	2.65	237	56	2	800	1,300	12
July 31	241	155	82	48	16	2.95	3.01	250	60	2	1,000	310	7

Table 18—Record of Experimental Filter Plant No. 2.

Date.	Preliminary Filter.		Final Filter.		Turbidity			Bacteria
	Rate, millions of gallons per acre daily.	Loss of head.	Rate, millions of gallons per acre daily.	Loss of head.	Applied water.	Effluent preliminary filter.	Effluent final filter.	Applied water.	Effluent preliminary filter.	Effluent final filter.
1907.
Feb. 8	21.50	0.04	2.81	0.17	...	...	...	1,100	2,100	...
Feb. 9	21.60	0.04	1.09	0.06	...	...	...	200	550	2,100
Feb. 10	20.90	0.05	1.59	0.08	...	...	...	...	...	...
Feb. 11	19.80	0.05	3.01	0.15	12	6	2	600	1,160	1,100
Feb. 12	19.70	0.06	3.01	0.14	12	5	2	650	400	700
Feb. 13	19.60	0.06	3.01	0.12	15	5	2	660	900	700
Feb. 14	24.70	0.07	2.65	0.13	15	6	2	650	1,100	900
Feb. 15	37.20	...	3.40	0.12	12	5	2	600	800	850
Feb. 16	37.30	...	3.40	0.11	14	4	2	850	950	600
Feb. 17	Shut down for changes in meters and piping.
Feb. 18	...	...	...	...	...	...	...	1,200	...	600
Feb. 21	44.50	...	4.36	0.19	20	6	2	1,800	1,400	800
Feb. 22	48.60	...	4.37	0.16	15	4	2	Holiday.
Feb. 23	48.40	...	4.20	0.15	20	7	2	1,600	750	380
Feb. 24	48.30	...	4.02	0.13	20	10	3	Sunday.
Feb. 25	Shut down several hours.			0.14	20	10	3	1,400	1,000	450
Feb. 26	48.60	0.04	4.12	0.14	20	10	3	700	800	260
Feb. 27	53.20	0.04	4.08	0.15	17	8	3	700	700	290
Feb. 28	52.80	0.04	4.09	0.15	15	8	3	800	650	500
Mar. 1	53.00	0.04	4.10	0.16	15	8	3	650	550	200
Mar. 2	53.30	0.04	4.11	0.16	15	7	3	1,000	800	300
Mar. 3	50.60	0.05	4.11	0.16	31	11	3	Sunday.
Mar. 4	42.40	0.05	4.12	0.17	35	15	6	1,200	1,500	360
Mar. 5	42.70	0.05	4.11	0.17	135	52	10	13,000	850	...
Mar. 6	48.60	0.07	4.13	0.17	135	54	12	18,000	8,000	...
Mar. 7	50.50	0.08	4.12	0.18	102	46	8	24,000	6,500	1,800
Mar. 8	51.80	0.09	4.12	0.18	100	40	6	22,000	6,000	1,600
Mar. 9	53.00	0.10	4.12	0.18	90	40	5	24,000	6,000	800
Mar. 10	54.40	0.12	4.11	0.19	82	39	6	Sunday.
Mar. 11	51.00	0.12	4.12	0.19	68	32	7	18,000	4,300	240
Mar. 12	51.20	0.12	4.07	0.19	46	25	5	11,000	4,600	210
Mar. 13	50.50	0.12	4.00	0.19	40	20	5	9,000	1,500	200
Mar. 14	46.50	0.12	...	0.20	39	20	4	5,500	1,200	90
Mar. 15	45.80	0.12	3.98	0.20	35	18	4	6,500	1,100	150
Mar. 16	42.50	0.12	3.97	0.19	60	24	4	5,000	800	160
Mar. 17	49.30	0.14	3.98	0.19	135	45	5	Sunday.
Mar. 18	52.60	0.16	3.98	0.20	170	59	9	9,000	1,700	100
Mar. 19	53.50	0.17	4.01	0.19	125	51	8	7,000	1,000	120
Mar. 20	52.90	0.17	3.99	0.18	102	40	6	4,800	700	75
Mar. 21	48.20	0.16	4.00	0.19	125	42	5	8,500	1,100	90
Mar. 22	51.80	0.18	4.01	0.20	190	82	5	7,500	1,100	55
Mar. 23	51.60	0.19	4.01	0.20	180	75	6	7,500	1,300	90
Mar. 24	48.20	0.17	4.01	0.20	140	68	7	Sunday.
Mar. 25	48.50	0.18	4.01	0.20	88	40	5	4,400	900	75
Mar. 26	45.90	0.18	3.98	0.20	62	32	4	3,600	750	90
Mar. 27	50.50	0.20	4.04	0.20	47	25	4	2,200	400	60
Mar. 28	49.60	0.20	3.92	0.19	35	16	3	1,300	350	55
Mar. 29	42.20	0.17	3.98	0.19	26	12	3	700	180	20
Mar. 30	48.00	0.22	4.01	0.19	25	7	3	310	220	39
Mar. 31	49.10	0.22	3.99	0.20	21	6	2	Sunday.
April 1	49.10	0.24	4.00	0.20	20	6	2	600	110	38
April 2	49.70	0.25	4.00	0.20	24	6	2	270	110	29
April 3	51.40	0.27	4.00	0.21	24	6	2	460	85	31
April 4	48.70	0.27	4.00	0.22	20	6	2	280	60	22
April 5	48.10	0.27	4.00	0.22	20	5	2	450	70	40
April 6	Shut down awaiting Mr. Maiguen to apply bone-charcoal.
April 7	Removed 1.06 in. of sand.							Sunday.
April 8	52.20	0.33	4.05	0.27	18	4	3	330	...	...
April 9	46.90	0.29	4.02	0.29	18	4	2	140	60	32
April 10	47.60	0.31	4.03	0.28	30	4	1	750	120	28
April 11	46.00	0.30	4.04	0.28	66	7	2	4,000	...	32
April 12	45.40	0.31	4.03	0.29	72	20	3	14,000	2,900	85
April 13	45.10	0.32	3.99	0.32	80	30	3	13,000	2,500	95
April 14	49.00	0.34	4.00	0.32	77	35	4	Sunday.
April 15	47.80	0.35	3.99	0.33	62	31	4	7,000	1,100	60
April 16	47.40	0.36	3.99	0.34	47	27	4	3,600	650	31
April 17	45.60	0.36	4.00	0.34	39	21	3	1,600	160	38
April 18	45.70	0.36	4.00	0.34	30	13	2	1,810	210	42
April 19	45.60	0.37	4.00	0.34	25	9	2	790	190	34
April 20	45.30	0.40	4.00	0.36	20	6	2	540	87	23
April 21	47.20	0.44	3.99	0.38	20	4	2	Sunday.
April 22	45.20	0.42	3.99	0.38	18	3	1	235	55	22
April 23	44.90	0.44	4.05	0.40	15	3	1	170	45	16
April 24	40.50	0.41	4.02	0.44	19	2	1	150	14	14
April 25	39.60	0.41	4.03	0.45	34	3	1	700	12	23
April 26	40.70	0.44	4.05	0.45	46	4	1	1,200	80	16
April 27	39.30	0.44	4.00	0.44	52	4	1	1,700	160	23
April 28	34.70	0.43	4.05	0.44	45	5	1	Sunday.
April 29	37.20	0.45	4.00	0.42	44	6	1	600	60	10
April 30	43.00	0.49	4.00	0.41	39	7	1	550	55	15
May 1	41.30	0.49	4.00	0.41	31	6	1	500	80	17
May 2	42.40	0.49	4.00	0.41	24	5	1	500	80	19
May 3	40.70	0.48	4.00	0.40	19	4	1	280	75	48
May 4	33.80	0.47	4.00	0.39	16	3	1	400	80	9
May 5	26.20	0.43	4.00	0.39	15	1	1	Sunday.
May 6	29.00	0.38	3.99	0.37	13	2	1	390	100	65
May 7	27.60	0.36	...	0.37	12	2	1	190	60	19
May 8	24.70	0.31	3.99	0.37	10	2	1	...	...	...
	Washed.
May 9	24.40	0.03	3.98	0.39	10	2	1	390	65	10
May 10	24.80	0.04	4.00	0.42	10	2	1	300	80	18
May 11	50.00	0.06	4.00	0.44	12	2	1	390	110	12
May 12	50.00	0.08	4.00	0.48	17	2	1	Sunday.
May 13	50.00	0.09	4.00	0.47	35	3	1	600	100	18
May 14	50.00	0.10	4.00	0.46	39	4	1	500	65	15
May 15	48.50	0.15	4.00	0.45	17	3	1	500	70	16
May 16	47.00	0.16	4.00	0.46	24	3	1	290	70	16
May 17	47.00	0.16	3.99	0.47	18	3	1	260	40	9
May 18	47.00	0.19	4.00	0.48	15	2	1	190	...	17
May 19	47.00	0.21	3.99	0.51	12	2	1	Sunday.
May 20	46.60	0.24	4.00	0.53	12	2	1	260	40	13
May 21	46.40	0.24	4.00	0.55	16	2	1	260	65	9
May 22	46.40	0.27	4.00	0.58	20	2	1	280	35	12
May 23	46.40	0.29	4.00	0.61	15	2	1	130	35	10
May 24	46.40	0.30	4.00	0.63	15	2	1	170	26	6
May 25	46.40	0.32	4.00	0.66	15	2	1	340	80	13
May 26	46.40	0.34	3.99	0.70	18	2	1	Sunday.
May 27	46.40	0.86	3.99	0.74	13	2	1	210	80	7
May 28	46.40	0.38	3.15	0.76	16	2	1	260	70	10
May 29	46.00	0.44	3.88	0.78	16	2	1	500	55	12
May 30	45.60	0.46	3.99	0.86	14	2	1	Holiday.
May 31	45.60	0.46	4.00	0.92	17	2	1	380	65	11
June 1	45.60	0.46	4.00	0.98	15	2	1	900	48	10
June 2	45.60	0.48	4.00	1.09	17	2	1	Sunday.
June 3	45.60	0.51	4.00	1.20	24	2	1	550	75	16
June 4	45.60	0.54	4.00	1.32	37	3	1	6,500	...	22
June 5	45.60	0.55	4.00	1.48	65	5	1	3,200	140	19
June 6	45.60	0.56	4.01	3.66	77	16	1	1,500	210	14
June 7	45.00	0.57	4.00	1.80	64	27	1	2,100	230	20
June 8	45.00	0.57	4.00	1.90	46	22	1	600	240	33
June 9	45.00	0.55	4.01	2.00	44	18	1	Sunday.
June 10	45.00	0.56	4.00	2.09	36	12	1	240	110	43
June 11	45.00	0.58	4.00	2.17	30	8	1	280	130	60
June 12	45.00	0.60	4.01	2.27	34	8	1	330	150	60
June 13	45.00	0.62	4.00	2.36	35	10	1	480	...	120
June 14	45.00	0.63	3.99	2.49	31	9	1	440	...	65
June 15	45.00	0.64	3.99	2.56	32	8	1	420	...	49
June 16	44.70	0.65	4.00	2.63	26	7	1	Sunday.
June 17	44.40	0.64	4.00	2.67	26	6	1	340	270	55
June 18	45.00	0.63	3.98	2.69	31	7	1	440	140	65
June 19	45.00	0.63	4.00	2.73	37	10	1	500	110	24
June 20	45.00	0.62	4.01	2.72	30	9	1	330	70	34
June 21	45.00	0.61	4.01	2.68	25	7	1	170	130	60
June 22	Shut down to scrape and apply asbestos and coke; removed 0.79 in. of sand.
June 23	Applied 8 lb. of asbestos and 10 lb. of bone-charcoal.
June 25	50.00	0.54	4.00	0.27	130	45	1	400	...	...
June 26	50.00	0.57	4.01	0.46	82	37	1	750	550	35
June 27	50.00	0.63	4.01	0.55	65	26	1	...	1,200	140
June 28	50.00	0.65	3.99	0.63	47	21	1	...	1,200	26
June 29	50.00	0.70	4.00	0.73	37	9	1	220	800	22
June 30	50.00	0.77	3.99	0.82	30	8	1	Sunday.
July 1	50.00	0.87	4.00	0.80	30	8	1	400	90	37
July 2	50.00	0.95	4.01	0.73	32	9	1	180	230	25
July 3	50.00	1.01	4.00	0.66	36	10	1	350	80	58
July 4	50.00	1.03	4.00	0.58	44	12	1	Holiday.
July 5	50.00	1.07	3.99	0.54	24	14	1	550	130	47
July 6	50.00	1.10	4.00	0.52	39	12	1	250	110	33
July 7	50.00	1.14	4.00	0.50	34	10	1	Sunday.
July 8	50.00	1.16	4.00	0.48	25	7	1	220	190	14
July 9	50.00	1.18	4.00	0.46	22	5	1	50	30	3
July 10	50.00	1.20	3.99	0.45	47	11	1	Lost.	Lost.	Lost.
July 11	50.00	1.20	3.99	0.45	90	30	1	150	140	12
July 12	50.00	1.20	4.01	0.44	97	35	1	300	110	20
July 13	50.00	1.15	4.00	0.47	90	39	1	220	120	14
July 14	50.00	1.15	4.00	0.48	90	40	1	Sunday.
July 15	50.00	1.14	3.99	0.48	95	40	1	375	320	19
July 16	50.00	1.19	4.00	0.48	120	45	1	Lost.	150	12
July 17	50.00	1.21	4.00	0.48	85	42	1	270	60	5
July 18	50.00	1.19	3.99	0.50	56	32	1	1,675	23	39
July 19	50.00	1.16	3.99	0.52	41	20	1	450	200	13
July 20	50.00	1.16	3.99	0.56	62	29	1	300	220	8
July 21	50.00	1.19	3.99	0.63	62	31	1	Sunday.
July 22	50.00	1.20	3.99	0.77	80	36	1	1,400	70	9
July 23	50.00	1.21	3.99	0.93	105	40	1	3,700	370	25
July 24	50.00	1.38	3.99	1.07	95	40	1	770	260	31
July 25	50.00	1.17	3.99	1.22	77	32	1	250	230	3
July 26	50.00	1.07	4.00	1.37	67	29	1	140	90	12
July 27	50.00	1.11	4.00		54	25	1	300	180	6
July 28	50.00	1.22	3.98	1.65	46	19	1	Sunday.
July 29	50.00	1.21	4.00	1.82	36	16	1	470	230	18
July 30	50.00	1.20	3.99	1.98	29	11	1	Plates lost.
July 31	50.00	1.20	3.99	2.11	21	9	1	Plates lost.
Aug. 1	51.00	1.21	3.99	2.27	16	6	1	Plates lost.
Aug. 2	51.00	1.21	3.99	2.43	15	4	1	130	130	4
Aug. 3	51.00	1.21	4.00	2.66	16	3	1	120	80	4
Aug. 4	50.00	1.21	3.99	2.95	21	3	1	Sunday.
Aug. 5	50.00	1.21	3.98	3.22	29	3	1	230	210	4
Aug. 6	50.00	1.22	3.98	3.50	34	4	1	85	320	19
Aug. 7	50.00	1.21	3.99	3.74	21	4	1	200	Lost.	19
Aug. 8	48.20	1.20	...	4.09	19	4	1	100	150	17
Aug. 9	50.00	1.18	...	4.45	16	3	1	75	220	9
Aug. 10	47.30	1.16	...	4.67	24	3	1	60	250	10
Aug. 11	Shut down to drain and scrape sand filter; O.9 in. depth over all.
Aug. 16	Out of service all the rest of month washing sponge and asbestos.
Sept. 3	50.00	0.02	4.00	0.16	12	5	1	300	...	...
Sept. 4	50.00	0.02	3.99	0.14	16	6	1	600	260	370
Sept. 5	50.00	0.02	4.01	0.13	34	6	1	360	71	165
Sept. 6	46.40	0.02	4.00	0.12	160	52	1	15,000	1,900	120
Sept. 7	50.00	0.03	4.00	0.11	64	26	1	2,000	170	62
Sept. 8	46.40	0.04	3.99	0.11	56	25	1	Sunday.
Sept. 9	50.00	0.05	4.90	0.11	59	25	1	220	13	19
Sept. 10	50.00	0.05	4.00	0.11	57	21	1	18,000	100	24
Sept. 11	50.00	0.06	4.00	0.11	65	25	1	2,700	150	25
Sept. 12	50.00	0.07	4.00	0.12	72	26	1	1,000	190	36
Sept. 13	50.00	0.08	4.00	0.12	87	30	1	2,300	...	35
Sept. 14	50.00	0.09	4.01	0.12	72	27	1	2,400	130	230
Sept. 15	48.20	0.11	4.00	0.12	65	25	1	Sunday.
Sept. 16	51.00	0.13	4.00	0.12	65	25	1	Lost.	Lost.	27
Sept. 17	50.00	0.14	4.00	0.12	52	21	1	420	60	29
Sept. 18	49.10	0.14	4.00	0.13	60	18	1	900	80	41
Sept. 19	50.00	0.15	4.00	0.13	85	22	1	2,000	...	19
Sept. 20	49.10	0.17	4.00	0.13	100	29	1	4,200	300	28
Sept. 21	49.10	0.18	4.00	0.13	120	34	1	1,100	160	30
Sept. 22	48.20	0.20	4.00	0.13	137	41	1	Sunday.
Sept. 23	49.10	0.19	4.00	0.13	112	37	1	2,400	90	34
Sept. 24	46.40	0.19	3.99	0.14	100	35	1	4,000	210	12
Sept. 25	46.40	0.20	4.00	0.14	432	80	1	56,000	510	27
Sept. 26	45.60	0.24	4.00	0.15	385	80	4	1,300	450	55
Sept. 27	44.80	0.27	4.00	0.16	245	70	3	4,000	240	41
Sept. 28	46.40	0.30	3.99	0.16	127	46	2	15,000	430	37
Sept. 29	46.40	0.31	3.99	0.16	105	41	2	Sunday.
Sept. 30	46.40	0.31	4.00	0.17	115	42	1	Lost.	1,600	110
Oct. 1	48.20	0.33	4.00	0.18	82	36	1	600	600	120
Oct. 2	50.00	0.33	4.01	0.19	65	27	1	4,400	170	47
Oct. 3	48.20	0.33	4.00	0.19	59	34	1	900	210	44
Oct. 4	48.20	0.34	4.00	0.19	55	20	1	850	200	37
Oct. 5	50.00	0.38	4.00	0.19	9	21	1	2,000	150	34
Oct. 6	48.20	0.41	4.00	0.19	59	24	1	Sunday.
Oct. 7	48.20	0.42	4.00	0.19	552	17	1	1,250	200	28
Oct. 8	50.00	0.42	4.00	0.19	54	16	1	11,000	210	28
Oct. 9	44.80	0.40	4.00	0.19	51	16	1	2,000	310	29
Oct. 10	48.20	0.42	4.00	0.19	50	15	1	800	220	16
Oct. 11	48.20	0.43	4.00	0.20	47	13	1	2,000	310	46
	Washed.
Oct. 12	50.00	0.14	4.00	0.20	36	11	1	1,200	370	25
Oct. 13	47.30	0.15	4.00	0.21	40	15	1	Sunday.
Oct. 14	50.00	0.18	4.00	0.22	47	19	1	1,200	390	22
Oct. 15	53.00	0.20	4.00	0.23	41	16	1	900	140	16
Oct. 16	50.00	0.20	4.00	0.24	35	12	1	Lost.	310	18
Oct. 17	50.00	0.21	4.00	0.25	30	8	1	550	180	7
Oct. 18	50.00	0.21	4.00	0.25	25	6	1	260	100	33
Oct. 19	50.00	0.21	4.00	0.25	25	6	1	750	220	15
Oct. 20	50.00	0.22	4.00	0.25	20	5	1	Sunday.
Oct. 21	50.00	0.23	4.00	0.25	19	5	1	480	120	11
Oct. 22	50.00	0.24	4.00	0.26	18	4	1	230	70	7
Oct. 23	50.00	0.25	4.00	0.26	15	3	1	250	120	12
Oct. 24	50.00	0.26	4.00	0.26	15	3	1	300	80	12
Oct. 25	50.00	0.27	4.00	0.27	15	2	1	450	60	15
Oct. 26	50.00	0.28	4.00	0.27	15	2	1	450	Lost.	14
Oct. 27	50.00	0.29	4.00	0.27	13	2	0	Sunday.
Oct. 28	50.00	0.30	4.00	0.27	13	2	0	190	110	9
Oct. 29	50.00	0.31	4.00	0.27	25	2	0	380	...	...
Oct. 30	50.00	0.32	4.00	0.27	21	3	0	...	...	...
Oct. 31	Out of commission. 4-in supply pipe stopped up.
Nov. 4	50.00	0.16	4.00	0.28	125	11	1	...	...	...
Nov. 5	50.00	0.17	4.00	0.28	185	61	1	6,000	3,000	220
Nov. 6	50.00	0.18	4.00	0.29	170	66	1	5,000	1,100	150
Nov. 7	50.00	0.20	4.00	0.30	100	45	1	14,000	1,600	120
Nov. 8	50.00	0.21	4.00	0.32	95	42	1	1,900	2,000	29
Nov. 9	50.00	0.22	4.00	0.34	80	36	1	4,000	2,000	110
Nov. 10	50.00	0.23	4.00	0.36	67	29	1	Sunday.
Nov. 11	50.00	0.24	3.46	0.38	52	20	1	1,900	460	160
Nov. 12	50.00	0.26	3.99	0.40	40	13	1	7,500	1,100	110
Nov. 13	50.00	0.27	4.00	0.44	36	10	1	1,600	550	50
Nov. 14	50.00	0.28	4.00	0.49	42	13	1	2,700	950	48
Nov. 15	50.00	0.29	4.00	0.55	35	11	1	1,800	900	49
Nov. 16	50.00	0.30	4.00	0.65	26	7	1	1,100	360	35
Nov. 17	50.00	0.31	3.98	0.80	20	5	1	Sunday.
Nov. 18	50.00	0.32	3.99	0.98	17	4	1	1,600	200	35
Nov. 19	50.00	0.34	3.99	1.26	16	3	1	1,300	400	55
Nov. 20	50.00	0.35	3.98	1.64	45	4	1	6,500	3,500	200
Nov. 21	50.00	0.36	3.99	2.03	52	12	1	9,900	4,500	130
Nov. 22	50.00	0.37	3.98	2.33	65	24	1	10,000	5,500	220
Nov. 23	50.00	0.38	3.99	2.60	49	19	1	18,000	3,500	100
Nov. 24	50.00	0.40	3.98	2.85	134	32	1	Sunday.
Nov. 25	48.20	0.45	3.98	3.10	225	87	2	50,000	19,000	340
Nov. 26	50.00	0.49	3.98	3.62	237	90	2	40,000	11,000	220
Nov. 27	50.00	0.51	3.99	4.15	185	77	2	16,000	7,500	310
Nov. 28	50.00	0.54	3.84	4.44	130	57	2	Holiday.
Nov. 29	50.00	0.55	3.67	4.55	80	36	1	10,000	2,200	80
Nov. 30	50.00	0.56	3.44	4.65	54	25	1	3,800	2,200	55
Dec. 2	Shut down to scrape sand filter.
Dec. 6	50.00	0.64	4.00	0.46	16	3	1	---	---	---
Dec. 7	50.00	0.64	4.00	0.39	14	3	1	2,400	1,200	490
Dec. 8	50.00	0.64	4.01	0.35	12	2	1	Sunday.
Dec. 9	50.00	0.65	4.01	0.33	11	2	1	1,200	420	60
Dec. 10	50.00	0.65	4.00	0.33	12	2	1	800	950	66
Dec. 11	47.30	0.64	4.00	0.35	255	84	3	6,500	1,600	140
Dec. 12	46.40	0.70	3.98	0.39	212	100	6	48,000	15,000	1,800
Dec. 13	50.00	0.79	3.98	0.49	495	217	9	42,000	20,000	1,600
Dec. 14	52.00	0.84	3.97	0.65	357	167	9	49,000	9,500	1,200
Dec. 15	49.10	0.84	3.98	0.77	157	76	6	Sunday.
Dec. 16	49.10	0.86	3.97	0.84	90	42	4	19,000	800	700
Dec. 17	49.10	0.88	3.98	0.91	70	31	2	21,000	18,000	1,600
Dec. 18	48.20	0.89	3.98	0.94	49	21	2	6,500	7,000	600
Dec. 19	50.00	0.91	3.98	0.97	39	13	1	Lost.	Lost.	Lost.
Dec. 20	49.10	0.92	3.98	1.03	42	16	1	"	"	"
Dec. 21	50.00	0.94	3.98	1.08	26	7	1	"	"	"
Dec. 22	50.00	0.97	3.98	1.13	20	5	1	Sunday.
Dec. 23	50.00	0.95	3.98	1.19	34	9	1	1,400	500	160
Dec. 24	47.30	0.93	3.98	1.28	195	75	2	9,000	1,700	130
Dec. 25	44.10	0.91	3.97	1.47	445	210	9	Holiday.
Dec. 26	46.40	1.01	3.97	1.63	370	172	7	51,000	8,000	250
Dec. 27	50.00	1.11	3.98	1.81	245	110	5	55,000	5,600	210
Dec. 28	48.20	1.12	3.99	1.87	102	46	3	10,000	4,500	140
Dec. 29	50.00	1.14	3.99	1.85	75	32	2	Sunday.
Dec. 30	49.10	1.15	3.98	1.86	56	24	2	4,400	1,900	190
Dec. 31	50.00	1.17	4.00	1.87	39	15	1	14,000	1,300	60
1908.
Jan. 1	50.00	1.18	3.98	1.90	31	8	1	...	...	...
Jan. 2	50.00	1.18	3.99	1.94	39	11	1	4,400	750	45
Jan. 3	50.00	1.19	3.98	1.98	36	11	1	3,100	1,600	70
	Washed.
Jan. 4	50.00	0.17	3.97	2.09	32	9	1	2,400	1,200	43
Jan. 5	50.00	0.18	3.98	2.22	26	6	1	Sunday.
Jan. 6	50.00	0.19	3.98	2.28	20	5	1	600	600	49
Jan. 7	50.00	0.20	3.98	2.37	20	5	1	1,100	330	49
Jan. 8	50.00	0.21	3.99	2.43	22	5	1	1,900	900	43
Jan. 9	50.00	0.23	3.98	2.52	45	13	1	13,000	3,400	50
Jan. 10	50.00	0.24	3.99	2.66	70	30	1	10,000	8,000	50
Jan. 11	50.00	0.27	3.98	2.74	56	22	1	16,000	220	200
Jan. 12	50.00	0.28	3.98	2.83	40	12	1	Sunday.
Jan. 13	49.10	0.30	3.98	2.93	110	51	2	8,500	1,200	43
Jan. 14	48.20	0.33	3.99	3.04	210	113	4	16,000	6,000	280
Jan. 15	46.40	0.35	3.98	3.21	325	222	15	24,000	9,500	700
Jan. 16	50.00	0.40	3.98	3.49	360	247	42	28,000	14,000	900
Jan. 17	50.00	0.43	3.98	3.86	242	147	26	65,000	20,000	1,200
Jan. 18	50.00	0.46	3.91	3.99	137	73	7	7,000	6,500	400
Jan. 19	...	...	...	...	...	...	...	Sunday.
Jan. 20	Scraped.
Jan. 21	50.00	0.48	3.00	0.76	55	25	4	...	...	...
Jan. 22	50.00	0.48	3.01	0.60	49	21	4	3,600	1,900	150
Jan. 23	50.00	0.49	3.00	0.57	40	15	3	1,800	700	170
Jan. 24	50.00	0.49	2.99	0.60	40	13	3	2,300	950	90
Jan. 25	50.00	0.50	2.99	0.65	39	12	3	1,100	800	95
Jan. 26	50.00	0.50	2.98	0.69	32	9	2	Sunday.
Jan. 27	50.00	0.51	2.99	0.76	32	9	2	300	700	70
Jan. 28	50.00	0.52	2.99	0.82	45	15	2	1,200	900	70
Jan. 29	50.00	0.55	2.99	0.90	60	26	2	1,000	1,400	95
Jan. 30	50.00	0.57	2.98	0.98	57	27	2	1,400	210	33
Jan. 31	50.00	0.58	2.98	1.08	42	18	2	1,100	750	45
Feb. 1	50.00	0.59	2.99	1.16	39	14	2	750	1,000	70
Feb. 2	49.10	0.60	2.99	1.22	27	9	2	Sunday.
Feb. 3	49.10	0.61	2.98	1.30	29	8	2	1,300	750	20
Feb. 4	50.00	0.64	2.99	1.40	25	6	2	600	900	60
Feb. 5	50.00	0.66	2.99	1.50	24	6	2	750	200	75
Feb. 6	50.00	0.67	2.99	1.55	20	5	2	2,000	800	60
Feb. 7	50.00	0.68	3.00	1.56	17	4	1	...	600	34
Feb. 8	50.00	0.69	3.00	1.53	15	4	1	900	220	35
Feb. 9	50.00	0.71	3.00	1.54	14	4	1	Sunday.
Feb. 10	50.00	0.72	2.99	1.60	11	4	1	850	500	28
Feb. 11	50.00	0.74	2.99	1.62	10	4	1	1,000	500	23
Feb. 12	50.00	0.75	2.98	1.68	8	4	1	750	290	18
Feb. 13	50.00	0.76	2.99	1.74	9	4	1	700	260	10
Feb. 14	48.20	0.76	2.99	1.77	9	4	1	1,200	250	27
Feb. 15	51.80	0.79	2.99	1.89	61	18	1	5,500	4,800	13
Feb. 16	48.20	0.79	2.99	2.08	80	40	2	Sunday.
Feb. 17	48.20	0.81	2.99	2.24	80	40	3	33,000	1,300	60
Feb. 18	47.30	0.82	2.99	2.31	130	65	3	...	950	120
Feb. 19	51.80	0.92	2.99	2.45	320	200	7	28,000	22,000	360
Feb. 20	52.70	0.99	2.99	2.61	177	97	9	22,000	16,300	350
Feb. 21	51.80	1.03	2.99	2.68	105	52	6	10,600	3,800	270
Feb. 22	50.90	1.07	2.99	2.72	85	42	5	Holiday.
Feb. 23	50.00	1.09	2.99	2.76	60	30	4	Sunday.
Feb. 24	51.80	1.12	2.99	2.80	46	19	3	3,600	1,700	120
Feb. 25	50.00	1.14	2.99	2.84	31	9	2	2,300	1,300	60
Feb. 26	50.00	1.17	3.00	2.87	30	8	2	3,800	1,300	43
Feb. 27	48.20	1.18	2.99	2.90	30	7	1	1,300	900	42
Feb. 28	47.30	1.19	2.99	2.94	37	7	1	1,400	800	31
Feb. 29	51.80	1.23	2.99	3.01	123	49	2	13,500	750	35
Mar. 1	48.20	1.20	2.98	2.99	97	44	5	Sunday.
Mar. 2	50.00	1.28	2.99	3.12	82	35	4	8,000	2,500	70
Mar. 3	50.90	1.32	2.98	3.22	87	38	4	11,000	6,000	55
Mar. 4	50.00	1.33	2.99	3.28	67	29	3	6,000	1,400	38
Mar. 5	50.00	1.35	2.99	3.32	59	23	3	4,400	2,500	37
Mar. 6	Discontinued; sand filter being used for sedimentation experiments.

Table 19—Record of Experimental Filter Plant. No. 3.

Date.	Sand Filter.		Turbidity.			Bacteria.			Coagulant.
	Rate.	Loss of head.	Applied water.	Effluent, coagulant.	Effluent, sand.	Applied water.	Effluent, coagulant.	Effluent, sand.	Grains, per gallon.
1907.
Feb. 12	2.99	0.18	14	...	2	...	...	...	...
Feb. 13	3.00	0.17	15	...	2	600	...	...	...
Feb. 14	3.19	0.18	15	...	2	650	...	...	...
Feb. 15	3.86	0.22	12	...	2	600	...	2,500	...
Feb. 16	3.84	0.29	14	...	2	850	...	1,600	...
Feb. 17	...	...	...	...	...	...	...	...	...
Feb. 18	...	...	...	...	...	1,200	...	300	...
Feb. 21	3.91	0.32	20	...	2	1,800	...	550	...
Feb. 22	3.95	0.39	15	...	2	2		Holiday.
Feb. 23	3.94	0.43	20	...	3	1,600	...	1,100	...
Feb. 24	3.89	0.47	20	...	3	3		Sunday.
Feb. 25	4.19	0.52	20	...	3	1,400	...	600	...
Feb. 26	4.13	0.57	20	...	3	700	...	650	...
Feb. 27	3.32	0.62	17	...	3	700	...	2,300	...
Feb. 28	4.41	0.67	15	...	3	800	...	550	...
Mar. 1	3.91	0.72	15	...	3	650	...	300	...
Mar. 2	3.93	0.79	15	...	3	1,000	...	270	...
Mar. 3	3.90	0.82	31	...	3		Sunday.
Mar. 4	3.92	0.80	35	...	3	1,200	...	140	1.45
Mar. 5	3.96	0.98	135	...	4	13,000	...	190	1.94
Mar. 6	4.05	1.25	135	29	2	18,000	2,100	160	2.03
Mar. 7	3.95	1.52	102	15	1	24,000	3,500	160	1.50
Mar. 8	3.90	1.67	100	15	1	22,000	1,800	130	1.38
Mar. 9	3.93	1.80	90	15	1	24,000	3,500	130	1.37
Mar. 10	3.95	1.91	82	16	1		Sunday.		1.26
Mar. 11	3.96	2.08	68	18	1	18,000	6,000	120	1.24
Mar. 12	4.02	2.19	46	18	1	11,000	9,000	140	1.08
Mar. 13	4.02	2.31	40	15	1	9,000	5,000	120	0.94
Mar. 14	3.96	2.44	39	16	1	5,500	3,600	90	0
Mar. 15	4.07	2.42	35	20	1	6,500	3,800	85	0
Mar. 16	3.85	2.20	60	29	1	5,000	3,500	100	1.26
Mar. 17	3.95	2.21	135	25	1		Sunday.		1.52
Mar. 18	3.88	2.86	170	25	1	9,000	1,900	85	1.75
Mar. 19	3.82	3.31	125	21	1	7,000	700	65	1.57
Mar. 20	3.78	3.47	102	20	1	4,800	1,500	60	1.31
Mar. 21	3.71	3.70	125	20	1	8,500	1,500	70	1.38
Mar. 22	3.64	3.81	190	25	1	7,500	1,100	35	1.57
Mar. 23	3.58	3.95	180	26	1	7,500	470	55	1.68
Mar. 24	3.46	4.18	140	19	1		Sunday.		1.52
Mar. 25	Scraped, 1.03 in. of sand removed.
Mar. 27	4.06	0.22	47	8	1	2,200	480	60	1.08
Mar. 28	4.02	0.37	35	...	0	1,300	250	80	1.00
Mar. 29	4.02	0.46	26	...	...	700	240	65	0
Mar. 30	Shut down to fill coagulant basin.
	...	...	25	...	...	310	...	...	0
Mar. 31	4.00	0.45	21	15	1		Sunday.		0
Apr. 1	3.39	0.42	20	15	1	600	1,000	43	0
Apr. 2	3.06	0.46	24	17	1	270	Lost.	35	0
Apr. 3	3.01	0.49	24	17	1	460	"	41	0
Apr. 4	2.95	0.50	20	15	1	280	550	27	0
Apr. 5	2.95	0.51	20	13	1	450	1,000	60	0
Apr. 6	2.96	0.49	20	12	1	320	50	35	0
Apr. 7	2.99	0.48	20	12	1	Sunday.	0
Apr. 8	3.01	0.49	18	12	1	330	650	22	0
Apr. 9	3.01	0.55	18	12	1	140	750	21	0
Apr. 10	3.02	0.57	30	15	0	750	5,000	29	0
Apr. 11	3.04	0.61	66	16	0	4,000	550	25	1.11
Apr. 12	3.09	0.72	72	13	0	14,000	2,200	17	1.15
Apr. 13	3.07	0.88	80	19	0	13,000	3,900	25	1.14
Apr. 14	2.98	1.04	77	18	1		Sunday.		1.17
Apr. 15	2.97	1.20	62	18	1	7,060	2,200	19	1.09
Apr. 16	3.01	1.32	47	17	1	3,600	900	22	1.08
Apr. 17	3.05	1.44	39	19	0	1,600	1,100	12	0
Apr. 18	3.04	1.41	30	20	1	1,810	1,870	14	0
Apr. 19	3.04	1.35	25	18	1	790	910	14	0
Apr. 20	3.07	1.30	20	15	1	540	480	15	0
Apr. 21	3.07	1.26	20	15	1		Sunday.		...
Apr. 22	3.04	1.21	18	12	0	235	420	21	0
Apr. 23	3.06	1.22	15	10	0	170	420	8	0
Apr. 24	2.99	1.26	19	10	0	150	250	17	0
Apr. 25	3.04	1.27	34	12	0	700	260	19	0
Apr. 26	3.07	1.28	46	12	0	1,200	320	80	0
Apr. 27	2.94	1.49	52	...	0	1,700	1,500	70	0
Apr. 28	2.96	1.88	45	...	1		Sunday.		0
Apr. 29	2.99	2.40	44	33	1	600	1,400	19	0
Apr. 30	3.00	2.83	39	29	1	550	1,200	14	0
May 1	3.01	2.71	31	21	1	500	1,300	20	0
May 2	3.01	2.51	24	15	1	500	850	16	0
May 3	3.00	2.36	19	12	1	280	650	34	0
May 4	3.01	2.29	16	10	0	400	550	24	0
May 5	3.01	2.25	15	9	0		Sunday.		0
May 6	3.06	2.32	13	8	0	390	460	80	0
May 7	2.96	2.46	12	7	0	190	...	18	0
May 8	3.00	2.51	10	5	0	...	...	...	0
May 9	3.00	2.77	10	5	0	390	1,100	14	0
May 10	3.01	2.87	10	5	0	300	500	21	0
May 11	2.99	3.16	12	6	0	390	650	16	0
May 12	3.00	3.34	17	7	0		Sunday.		0
May 13	3.00	3.44	35	9	0	600	470	27	0
May 14	3.01	3.46	39	12	0	500	550	25	0
May 15	3.01	3.56	17	...	0	500	900	23	0
May 16	2.93	4.07	24	...	0	290	2,500	25	0
May 17	3.01	4.34	18	...	0	260	2,000	16	0
May 18	2.93	4.25	15	8	0	190	600	19	0
May 19	2.97	4.36	12	8	0		Sunday.		0
May 20	3.01	4.64	12	8	0	260	450	15	0
May 21	2.99	4.55	16	8	0	260	330	14	0
May 22	3.01	4.57	20	8	0	280	390	22	0
May 23	3.00	4.51	15	8	0	130	240	19	0
May 24	2.98	4.44	15	8	0	170	240	30	0
May 25	3.00	4.38	15	8	0	340	400	41	0
May 26	3.00	4.38	18	8	0		Sunday.		0
May 27	Shut down to scrape sand filter; 1.09 in. of sand removed.
May 28	Cleaning coagulant basin and treating coagulant basin with 1:2,000,000 solution of copper sulphate.
May 29			16	...	...	solution of copper sulphate.
May 30	3.00	0.11	14	8	1		Holiday.		0
May 31	3.01	0.10	17	8	1	380	18,000	150	0
June 1	3.01	0.09	15	8	1	900	7,000	150	0
June 2	3.01	0.10	17	8	1		Sunday.		0
June 3	3.01	0.10	24	10	1	550	8,000	130	0
June 4	3.04	0.11	37	13	1	6,500	7,500	140	0
June 5	3.00	0.11	65	29	1	3,200	3,600	110	0
June 6	3.00	0.11	77	46	1	1,500	800	60	1.17
June 7	2.99	0.12	64	21	1	2,100	1,500	90	1.18
June 8	2.98	0.17	46	22	1	660	1,000	60	0
June 9	3.00	0.18	44	30	1		Sunday.		0
June 10	3.01	0.18	36	26	1	240	400	32	0
June 11	3.00	0.17	30	20	1	280	300	31	0
June 12	3.00	0.17	34	22	1	330	...	28	0
June 13	2.99	0.17	35	25	1	480	480	39	0
June 14	2.98	0.17	31	22	1	440	550	32	0
June 15	2.99	0.19	32	22	1	420	450	27	0
June 16	3.02	0.21	26	18	1		Sunday.		0
June 17	2.99	0.23	26	16	1	340	750	14	0
June 18	3.02	0.25	31	20	1	440	750	21	0
June 19	3.02	0.29	37	27	1	500	460	35	0
June 20	3.00	0.32	30	21	1	330	440	88	0
June 21	3.01	0.36	25	16	1	170	370	23	0
June 22	3.00	0.40	20	12	1	100	300	17	0
June 23	2.97	0.43	26	11	1		Sunday.		0
June 24	2.97	0.44	140	36	1	1,700	350	22	1.59
June 25	3.02	0.45	130	27	1	400	250	16	1.55
June 26	Interrupted, defective meter.					750	330	...	0
June 27	3.00	0.43	65	15	0	...	1,400	...	0
June 28	3.00	0.44	47	19	0	...	1,400	120	0
June 29	2.99	0.44	37	20	0	220	300	...	0
June 30	2.97	0.42	30	19	0		Sunday.		0
July 1	2.99	0.37	30	18	0	400	600	85	0
July 2	3.01	0.33	32	19	0	180	1,000	50	0
July 3	3.00	0.31	36	21	0	350	310	21	0
July 4	3.00	0.30	44	30	0		Holiday.
July 5	3.00	0.29	44	35	0	550	400	41	0
July 6	3.00	0.28	39	30	0	250	280	22	0
July 7	3.00	0.28	34	24	0		Sunday.		0
July 8	3.00	0.28	25	16	0	220	260	27	0
July 9	3.00	0.27	22	13	0	50	40	19	0
July 10	2.98	0.27	47	27	1	Lost.	Lost.	Lost.	0
July 11	3.00	0.27	90	41	1	150	50	8	1.27
July 12	3.00	0.29	97	21	1	300	200	13	1.27
July 13	3.00	0.34	90	20	0	220	160	17	1.27
July 14	3.00	0.40	90	19	0		Sunday.		1.27
July 15	3.00	0.54	95	18	0	375	150		1.27
July 16	3.00	0.59	120	20	0	Lost.	50	Lost.	1.36
July 17	3.00	0.58	85	16	0	270	60	3	1.26
July 18	2.99	0.61	56	13	0	1,675	70		1.17
July 19	3.01	0.61	41	18	0	450	700	11	0
July 20	2.99	0.51	62	27	0	300	720	8	0
July 21	3.00	0.47	62	32	0		Sunday.		0
July 22	3.00	0.47	80	34	0	1,400	560	14	1.17
July 23	3.01	0.49	105	21	0	3,700	490	40	1.25
July 24	3.01	0.60	95	19	0	770	110	80	1.27
July 25	3.00	0.68	77	16	0	250	80	5	1.22
July 26	2.99	0.68	67	17	0	140	40	4	0
July 27	3.00	0.69	54	20	0	300	130	21	0
July 28	3.00	0.72	46	27	0		Sunday.		0
July 29	3.00	0.74	36	26	0	470	290	100	0
July 30	2.99	0.76	29	19	0	Lost.	Lost.	Lost.	0
July 31	2.99	0.77	21	12	0	Lost.	Lost.	Lost.	0
Aug. 1	3.00	0.75	16	9	0	Lost.	Lost.	Lost.	0
Aug. 2	3.00	0.74	15	8	0	130	140	4	0
Aug. 3	3.00	0.74	16	7	0	120	180	6	0
Aug. 4	3.00	0.75	21	6	0		Sunday.
Aug. 5	3.00	0.76	29	8	0	230	100	44	0
Aug. 6	3.00	0.79	34	12	0	85	470	...	0
Aug. 7	2.99	1.01	21	12	0	200	450	...	0
Aug. 8	3.00	1.31	19	11	0	100	180	45	0
Aug. 9	2.98	1.44	16	9	0	75	80	16	0
Aug. 10	3.00	1.44	24	9	0	60	90	11	0
Aug. 11	3.00	1.49	62	22	0		Sunday.
Aug. 12	3.00	1.62	120	39	0	620	260	16	1.45
Aug. 13	2.97	2.06	107	22	0	820	520	10	1.38
Aug. 14	2.97	3.06	82	19	0	850	120	26	1.22
Aug. 15	2.81	3.91	65	15	0	150	260	6	1.17
Aug. 16	3.00	4.29	45	18	0	270	340	17	0
Aug. 17	3.00	3.86	35	22	0	340	200	13	0
Aug. 18	3.00	3.47	21	13	0		Sunday.
Aug. 19	3.00	3.49	18	10	0	180	220	17	0
Aug. 20	3.00	3.56	20	8	0	210	180	16	0
Aug. 21	3.00	3.58	20	10	0	1,300	650	8	0
Aug. 22	2.99	3.73	27	13	0	3,800	360	6	0
Aug. 23	3.00	4.00	49	34	0	2,500	700	10	0
Aug. 24	3.00	4.05	36	26	0	3,900	630	12	0
Aug. 25	2.98	4.06	34	24	0		Sunday.
Aug. 26	3.00	4.20	21	13	0	700	310	16	0
Aug. 27	3.00	4.31	19	11	0	470	250	12	0
Aug. 28	2.99	4.40	18	10	0	500	160	18	0
Aug. 29	3.01	4.41	17	9	0	360	110	9	0
Aug. 30	2.98	4.46	15	8	0	320	310	14	0
Aug. 31	Scraped. 1.88 in. of sand removed.		13	...	...	200	100	...	0
Sept. 5	3.00	0.10	34	4	0	360	950	...	1.04
Sept. 6	3.00	0.10	160	3	0	15,000	1,500	190	1.35
Sept. 7	3.00	0.09	64	3	0	2,000	260	100	1.20
Sept. 8	3.00	0.08	56	4	0		Sunday.	...	1.04
Sept. 9	3.00	0.08	59	3	0	220	180	38	1.04
Sept. 10	2.97	0.07	57	3	0	18,000	150	29	1.06
Sept. 11	2.98	0.07	65	2	0	2,700	200	37	1.04
Sept. 12	2.98	0.08	72	2	0	1,000	125	19	1.04
Sept. 13	3.00	0.08	87	3	0	2,300	200	72	1.20
Sept. 14	3.00	0.08	72	3	0	2,400	360	36	1.12
Sept. 15	3.00	0.08	65	3	0		Sunday.		1.04
Sept. 16	3.00	0.08	65	2	0	Lost.	Lost.	38	1.04
Sept. 17	3.00	0.08	52	2	0	420	200	38	1.07
Sept. 18	3.00	0.08	60	2	0	900	200	17	1.07
Sept. 19	2.98	0.08	85	2	0	2,000	220	25	1.12
Sept. 20	2.98	0.09	100	2	0	4,200	320	31	1.24
Sept. 21	2.99	0.09	120	3	0	1,100	160	19	1.33
Sept. 22	3.00	0.09	137	3	0		Sunday.		1.45
Sept. 23	3.02	0.09	112	4	0	2,100	190	15	1.41
Sept. 24	3.00	0.10	100	4	0	4,000	620	13	1.33
Sept. 25	3.00	0.11	432	3	0	56,000	290	7	1.83
Sept. 26	2.99	0.11	385	2	0	1,300	950	19	2.34
Sept. 27	3.00	0.12	245	4	0	4,000	Lost.	20	1.91
Sept. 28	2.98	0.13	127	4	0	15,000	1,000	8	1.54
Sept. 29	2.98	0.14	105	4	0		Sunday.		1.34
Sept. 30	2.99	0.15	115	3	0	Lost.	Lost.	46	1.35
Oct. 1	3.00	0.15	82	3	0	600	1,700	22	1.24
Oct. 2	2.98	0.16	65	3	0	4,400	550	8	1.09
Oct. 3	3.00	0.17	59	2	0	900	330	15	1.04
Oct. 4	2.99	0.17	55	2	0	850	250	11	1.03
Oct. 5	2.99	0.19	59	2	0	2,000	450	25	1.04
Oct. 6	2.98	0.20	59	2	0		Sunday.		1.04
Oct. 7	2.98	0.21	52	2	0	1,250	2,300	42	1.04
Oct. 8	2.97	0.21	54	2	0	11,000	100	15	1.04
Oct. 9	2.98	0.22	51	2	0	2,000	1,600	7	1.04
Oct. 10	2.98	0.24	50	2	0	800	Lost.	24	1.04
Oct. 11	2.98	0.25	47	2	0	2,000	1,200	21	0
Oct. 12	2.97	0.26	36	3	0	1,200	1,200	19	0
Oct. 13	2.98	0.27	40	4	0		Sunday.		0
Oct. 14	2.98	0.29	47	5	0	1,200	830	25	0
Oct. 15	2.99	0.31	41	5	0	900	Lost.	105	0
Oct. 16	2.99	0.32	35	4	0	Lost.	550	19	0
Oct. 17	2.98	0.34	30	4	0	550	800	21	0
Oct. 18	3.00	0.35	25	4	0	260	350	9	0
Oct. 19	3.00	0.35	25	4	0	750	310	35	0
Oct. 20	3.00	0.35	20	3	0		Sunday.		0
Oct. 21	3.00	0.35	19	3	0	480	540	35	0
Oct. 22	2.99	0.36	18	3	0	230	440	17	0
Oct. 23	2.99	0.37	15	3	0	250	440	39	0
Oct. 24	2.98	0.38	15	3	0	300	500	60	0
Oct. 25	2.99	0.39	15	3	0	450	410	65	0
Oct. 26	2.99	0.40	15	3	0	450	500	44	0
Oct. 27	2.99	0.41	13	2	0		Sunday.		0
Oct. 28	2.99	0.43	13	2	0	190	500	50	0
Oct. 29	2.98	0.44	25	2	0	380	60	75	0
Oct. 30	2.99	0.46	21	2	0	450	180	3	0
Oct. 31	2.96	0.48	25	3	0	2,300	390	75	0
Nov. 4	3.00	0.51	125	2	0	...	...	...	0
Nov. 5	3.00	0.53	185	2	0	6,000	1,600	90	1.70
Nov. 6	2.99	0.56	170	2	0	5,000	3,900	6	1.70
Nov. 7	2.99	0.60	100	3	0	14,000	300	9	1.48
Nov. 8	2.99	0.64	95	3	0	1,900	230	2	1.27
Nov. 9	2.99	0.70	80	4	0	4,000	2,700	200	0
Nov. 10	2.99	0.79	67	4	0		Sunday.		0
Nov. 11	2.99	1.00	52	6	0	1,900	2,000	200	0
Nov. 12	2.99	1.46	40	9	0	7,500	2,300	160	0
Nov. 13	2.98	2.09	36	10	0	1,600	1,100	170	0
Nov. 14	2.99	2.74	42	9	0	2,700	950	130	0
Nov. 15	2.99	2.98	35	8	0	1,800	800	11	0
Nov. 16	2.99	3.03	26	8	0	1,100	800	90	0
Nov. 17	3.00	3.07	20	6	0		Sunday.		0
Nov. 18	3.00	3.09	17	5	0	1,600	700	100	0
Nov. 20	2.99	3.17	45	3	0	6,500	120	120	0
Nov. 21	2.99	3.22	52	3	0	9,900	1,000	80	0
Nov. 22	2.99	3.27	65	5	0	10,000	3,200	90	0
Nov. 23	2.99	3.33	49	8	0	18,000	2,400	100	0
Nov. 24	2.99	3.41	134	11	0		Sunday.		0
Nov. 25	2.98	3.54	225	12	1	50,000	2,100	65	1.68
Nov. 26	2.98	3.68	237	13	1	40,000	2,400	95	1.76
Nov. 27	2.99	3.96	185	16	1	16,000	2,600	60	1.74
Nov. 28	2.98	4.29	130	18	1		Holiday.		1.57
Nov. 29	2.97	4.48	80	19	1	10,000	2,500	65	1.50
Nov. 30	2.97	4.54	54	15	1	3,800	1,900	85	0
Dec. 6	Scraped, 1.62 in. of sand removed.
Dec. 8	2.97	0.16	12	3	0		Sunday.		1.17
Dec. 9	2.98	0.16	11	3	0	1,200	410	10	1.17
Dec. 10	2.98	0.15	12	3	0	800	550	150	1.17
Dec. 11	2.99	0.15	255	3	0	6,500	600	130	1.52
Dec. 12	3.00	0.13	212	2	0	48,000	500	130	1.99
Dec. 13	2.98	0.13	495	4	0	42,000	500	120	2.06
Dec. 14	2.99	0.14	357	5	0	49,000	750	150	2.12
Dec. 15	2.99	0.15	157	6	0		Sunday.		1.69
Dec. 16	2.98	0.16	90	9	0	19,000	900	20	1.28
Dec. 17	2.98	0.20	70	12	0	21,000	400	170	1.17
Dec. 18	2.98	0.24	49	12	1	6,500	7,000	350	1.17
Dec. 19	2.98	0.29	39	9	1	Lost.	Lost.	Lost.	1.17
Dec. 20	2.98	0.36	42	7	1	Lost.	Lost.	Lost.	1.17
Dec. 21	2.97	0.45	26	5	0	Lost.	Lost.	Lost.	1.17
Dec. 22	2.98	0.57	20	4	0		Sunday.		1.17
Dec. 23	2.98	0.71	34	3	0	1,400	1,300	220	1.17
Dec. 24	2.98	0.83	195	2	0	9,000	1,000	140	1.49
Dec. 25	2.98	0.97	445	2	0		Holiday.		2.43
Dec. 26	2.98	1.11	370	2	0	51,000	1,000	39	2.15
Dec. 27	2.98	1.27	245	3	0	55,000	1,600	70	1.91
Dec. 28	2.98	1.40	102	4	0	10,000	1,000	80	1.50
Dec. 29	2.98	1.60	75	3	0		Sunday.		1.21
Dec. 30	2.97	1.85	56	3	0	4,400	700	80	1.17
Dec. 31	2.98	2.07	39	2	0	14,000	1,200	65	1.17
1908.
Jan. 1	2.99	2.11	31	2	0		Holiday.		1.17
Jan. 2	2.98	2.17	39	2	0	4,400	700	19	1.17
Jan. 3	2.98	2.26	36	2	0	3,100	1,000	13	1.17
Jan. 4	2.98	2.34	32	2	0	2,400	550	19	1.17
Jan. 5	2.98	2.41	26	2	0		Sunday.		1.17
Jan. 6	2.98	2.49	20	2	0	600	230	18	1.17
Jan. 7	2.98	2.58	20	2	0	1,100	370	12	1.17
Jan. 8	2.99	2.61	22	2	0	1,900	1,100	20	1.17
Jan. 9	2.99	2.63	45	2	0	13,000	1,200	22	1.21
Jan. 10	2.98	2.67	70	2	0	10,000	700	16	1.17
Jan. 11	2.98	2.72	56	2	0	16,000	1,200	11	1.17
Jan. 12	2.98	2.78	40	2	0		Sunday.		1.17
Jan. 13	2.98	2.84	110	2	0	8,500	90	6	1.27
Jan. 14	2.98	2.95	210	2	0	16,000	150	23	1.56
Jan. 15	2.98	3.07	325	3	0	24,000	1,100	19	1.92
Jan. 16	2.98	3.23	360	5	6	28,000	1,000	14	2.10
Jan. 17	2.97	3.73	242	6	0	65,000	490	23	1.91
Jan. 18	2.98	4.42	137	6	0	7,000	1,600	14	1.66
Jan. 19	2.99	4.75	117	5	0		Sunday.		1.50
Jan. 21	Scrape, 1.45 in. of sand removed.
Jan. 23	3.00	0.14	40	3	0	...	...	...	1.17
Jan. 24	3.00	0.14	40	3	0	2,300	550	55	1.17
Jan. 25	3.00	0.13	39	3	0	1,100	850	95	0
Jan. 26	3.00	0.13	32	3	0		Sunday.		0
Jan. 27	3.00	0.13	32	2	0	300	280	60	0
Jan. 28	2.99	0.15	45	3	0	1,200	700	70	0
Jan. 29	2.99	0.20	69	6	1	1,000	900	75	0
Jan. 30	2.99	0.24	57	8	1	1,400	650	50	0
Jan. 31	2.99	0.30	42	6	1	1,100	600	36	0
Feb. 1	2.99	0.34	39	5	1	750	50	25	0
Feb. 2	2.99	0.41	27	4	1		Sunday.		0
Feb. 3	2.99	0.51	29	3	0	1,300	220	16	0
Feb. 4	2.99	0.56	25	3	0	600	370	10	0
Feb. 5	2.99	0.58	24	4	0	750	700	21	0
Feb. 6	2.99	0.61	20	6	0	2,000	650	4	0
Feb. 7	3.00	0.64	17	8	1	...	410	26	0
Feb. 8	2.99	0.66	15	8	1	900	160	42	0
Feb. 9	3.00	0.67	14	8	1		Sunday.		0
Feb. 10	2.99	0.67	11	8	1	850	450	18	0
Feb. 11	3.00	0.66	10	7	1	1,000	600	26	0
Feb. 12	3.01	0.64	8	6	1	750	350	16	0
Feb. 13	3.00	0.62	9	5	1	700	120	10	0
Feb. 14	3.00	0.61	9	5	1	1,200	950	43	0
Feb. 15	3.00	0.60	61	5	1	5,500	1,000	23	0
Feb. 16	3.00	0.60	80	6	1		Sunday.		0
Feb. 17	3.00	0.62	80	14	1	33,000	6,100	36	0
Feb. 18	2.99	0.67	130	20	1	...	2,000	11	0
Feb. 19	2.99	0.76	320	18	2	28,000	9,000	120	0
Feb. 20	2.99	0.83	177	15	2	22,000	8,500	190	0
Feb. 29	3.00	0.85	123	8	1	...	...	...	0
Mar. 1	3.00	0.87	97	9	1		Sunday.		0
Mar. 2	2.99	0.92	82	13	1	8,000	4,400	50	0
Mar. 3	2.98	0.96	87	19	1	11,000	2,100	26	0
Mar. 4	2.99	1.02	67	21	1	6,000	4,700	7	0
Mar. 5	2.99	1.08	59	25	1	4,400	10,000	36	0
Mar. 6	2.99	1.15	72	25	2	7,000	7,400	50	0
Mar. 7	2.98	1.21	82	25	2	9,500	6,500	28	0
Mar. 8	2.99	1.25	92	29	2		Sunday.		0
Mar. 9	2.99	1.30	125	34	2	11,000	4,800	25	0
Mar. 10	2.99	1.35	142	39	2	8,500	1,200	23	0
Mar. 11	2.99	1.39	155	35	2	6,500	2,400	20	0
Mar. 12	2.99	1.42	135	29	2	5,900	1,500	11	0
Mar. 13	2.99	1.46	122	19	2	1,900	1,100	12	0
Mar. 14	2.99	1.47	97	12	1	1,800	700	6	0
Mar. 15	2.99	1.48	77	8	1		Sunday.		0
Mar. 16	3.00	1.52	65	9	0	1,400	700	8	0
Mar. 17	2.99	1.66	59	7	0	900	800	11	0
Mar. 18	2.99	1.72	67	11	1	1,000	650	8	0
Mar. 19	2.99	1.75	60	24	1	...	600	18	0
Mar. 20	2.99	1.81	57	25	1	1,300	750	20	0
Mar. 21	2.99	1.89	67	22	1	800	480	18	0
Mar. 22	2.99	1.95	80	21	1		Sunday.		0
Mar. 23	3.00	2.00	90	26	1	4,600	440	19	0
Mar. 24	2.98	2.06	82	32	1	2,500	1,200	10	0
Mar. 25	2.99	2.17	67	39	1	1,600	650	20	0
Mar. 26	2.99	2.24	60	36	1	550	410	7	0
Mar. 27	2.99	2.29	59	30	1	900	900	29	0
Mar. 28	3.00	2.32	51	21	1	650	250	42	0
Mar. 29	2.99	2.35	31	18	1		Sunday.		0
Mar. 30	3.00	2.38	30	14	1	500	650	28	0
Mar. 31	2.99	2.43	39	9	1	750	290	30	0
Apr. 1	2.99	2.50	44	7	1	750	390	32	0
Apr. 2	2.99	2.58	42	8	1	1,100	280	47	0
Apr. 3	2.99	2.65	41	11	1	1,500	550	70	0
Apr. 4	2.99	2.74	54	12	1	700	380	4	0
Apr. 5	3.00	2.82	50	12	1		Sunday.		0
Apr. 6	2.99	2.88	41	14	1	440	150	4	0
Apr. 7	2.99	2.98	35	13	1	650	270	42	0
Apr. 8	2.98	3.15	39	11	1	550	210	65	0
Apr. 9	2.99	3.35	40	8	1	390	160	95	0
Apr. 10	2.98	3.50	40	8	1	500	130	130	0
Apr. 11	2.99	3.65	45	7	0	430	145	100	0
Apr. 12	2.99	3.79	52	5	0		Sunday.		0
Apr. 13	2.99	3.92	50	4	0	490	160	80	0
Apr. 14	2.99	4.05	45	4	0	550	170	90	0
Apr. 15	2.99	4.16	45	3	0	420	160	12	0
Apr. 16	...	4.24	45	3	0	360	130	90	0
Apr. 21	Scraped, 0.12 in. of sand removed.
Apr. 23	...	0.13	25	2	0	140	140	...	0
Apr. 24	3.00	0.12	21	2	0	200	Lost.	150	0
Apr. 25	3.00	0.10	20	2	0	85	550	45	0
Apr. 26	3.00	0.10	21	3	0		Sunday.		0
Apr. 27	3.00	0.10	18	3	0	95	850	50	0
Apr. 28	3.00	0.10	20	3	0	70	220	48	0
Apr. 29	3.00	0.09	24	3	0	110	210	95	0
Apr. 30	3.00	0.09	21	3	0	70	140	29	0
May 1	3.00	0.09	32	3	0	130	210	65	0
May 2	3.00	0.09	26	3	0	140	140	55	0
May 3	3.00	0.11	22	5	0		Sunday.		0
May 4	3.00	0.11	19	4	0	85	210	75	0
May 5	3.00	0.11	18	4	0	130	150	48	0
May 6	2.99	0.12	18	3	0	230	430	50	0
May 7	3.00	0.13	19	3	0	160	90	40	0
May 8	3.00	0.14	19	3	0	375	425	7	0
May 9	2.99	0.14	18	3	0	1,209	180	6	0
May 10	3.00	0.14	30	3	0		Sunday.		0
May 11	3.00	0.13	60	3	0	2,800	150	12	0
May 12	3.00	0.13	70	3	0	2,900	225	26	0
May 13	3.00	0.13	66	7	0	1,800	450	53	0
May 14	3.00	0.14	45	9	0	2,700	550	10	0
May 15	2.99	0.14	39	7	0	950	300	65	0
May 16	2.99	0.22	49	6	0	800	250	49	0
May 17	2.99	0.33	46	4	0		Sunday.		0
May 18	2.99	0.44	31	3	0	700	1,700	80	0
May 19	2.98	0.62	36	3	0	375	950	53	0
May 20	2.99	0.75	41	3	0	425	700	46	0
May 21	2.99	0.89	31	4	0	300	600	6	0
May 22	2.99	1.01	50	5	0	950	230	17	0
May 23	2.99	1.12	127	5	0	2,400	32	28	0
May 24	2.99	1.20	110	6	0		Sunday.		0
May 25	2.99	1.24	90	9	0	1,100	850	9	0
May 26	2.98	1.31	135	11	0	3,200	150	17	0
May 27	2.97	1.54	110	12	0	1,450	175	8	0
May 28	2.97	1.81	90	10	0	1,000	132	7	0
May 29	2.97	2.08	70	7	0	1,100	230	8	0
May 30	2.97	2.36	50	5	0		Holiday.		0
May 31	2.98	2.63	34	4	0		Sunday.		0
June 1	2.98	2.77	35	2	0	...	...	...	0
June 2	2.98	2.84	39	2	0	...	...	...	0
June 3	2.98	3.02	35	3	0	...	...	...	0
June 4	3.00	3.01	30	4	0	...	...	...	0
June 5	3.00	2.97	30	5	0	...	...	...	0
June 6	3.01	2.81	27	5	0	...	...	...	0
June 7	3.01	2.62	22	5	0	...	...	...	0
June 8	3.01	2.38	20	4	0	...	...	...	0
June 9	3.00	2.19	20	3	0	...	...	...	0
June 10	3.01	2.02	17	3	0	...	...	...	0
June 11	2.99	1.89	12	3	0	...	...	...	0
June 12	2.98	1.92	11	2	0	...	...	...	0
June 13	2.98	1.99	36	2	0	...	...	...	0
June 14	2.98	2.08	39	2	0	...	...	...	0
June 15	2.98	2.25	25	4	0	...	...	...	0
June 16	2.98	2.54	34	5	0	...	...	...	0
June 17	2.97	2.85	64	5	0	...	...	...	0
June 18	2.97	3.20	57	5	0	...	...	...	0
June 19	2.98	3.47	46	7	0	...	...	...	0
June 20	2.99	3.73	37	8	0	...	...	...	0
June 21	2.99	4.10	29	8	0	...	...	...	0
June 22	2.99	4.44	25	6	0	...	...	...	0
June 23	2.99	4.61	25	5	0	...	...	...	0
June 26	3.01	0.09	15	2	0	...	...	...	0
June 27	3.00	0.09	12	2	0	...	...	...	0
June 28	3.00	0.09	9	2	0	...	...	...	0
June 29	3.00	0.08	8	2	0	...	...	...	0
June 30	3.00	0.07	10	2	0	...	...	...	0
July 1	3.00	0.07	6	2	0	80	75	3	0
July 2	3.00	0.07	8	2	0	290	20	3	0
July 3	3.00	0.07	8	2	0	350	140	4	0
July 4	3.00	0.07	9	2	0		Holiday.		0
July 5	3.00	0.07	10	2	0		Sunday.		0
July 6	3.00	0.07	9	2	0	300	52	4	0
July 7	3.00	0.07	8	2	0	110	35	2	0
July 8	3.00	0.07	9	2	0	85	105	2	0
July 9	3.00	0.07	8	2	0	85	80	3	0
July 10	...	...	...	...	...	300	65	1	0
July 11	3.00	0.08	12	2	0	145	95	11	0
July 12	3.00	0.08	11	2	0		Sunday.		0
July 13	3.00	0.08	10	2	0	115	105	7	0
July 14	3.00	0.09	16	2	0	800	34	1	0
July 15	3.00	0.09	17	2	0	180	165	3	0
July 16	3.00	0.10	14	2	6	100	95	2	0
July 17	3.00	0.10	10	2	0	65	65	1	0
July 18	3.00	0.11	11	2	0	38	200	24	0
July 19	3.00	0.11	12	2	0		Sunday.		0
July 20	3.00	0.12	10	2	0	95	31	1	0
July 21	3.00	0.12	10	2	0	70	100	2	0
July 22	3.00	0.13	13	2	0	450	13	4	0
July 23	2.99	0.13	54	2	0	650	325	4	0
July 24	2.99	0.14	305	2	0	1,650	325	...	0
July 25	3.00	0.15	330	4	0	2,600	55	2	0
July 26	3.00	0.15	290	9	0		Sunday.		0
July 27	3.00	0.16	335	11	0	35,000	1,200	6	0
July 28	2.99	0.17	170	10	0	1,200	675	6	0
July 29	3.00	0.17	180	8	0	2,000	270	11	0
July 30	2.99	0.18	237	7	0	800	190	2	0
July 31	3.00	0.19	250	6	0	1,000	310	6	0

Table 20—Summary of Results of Experimental Filters.

Filter number Number of runs	1 3	2 6	3 11	4 12	5 25	6 28
Rate, million gallons per acre per day:
Maximum...............	1.35	3.95	7.96	12.60	37.5	118.9
Minimum................	0.62	2.30	3.73	5.77	6.68	7.1
Average.................	1.06	3.26	6.69	10.17	26.1	38.54
Length of run, in days:
Maximum...............	233.5	150.5	75.2	90.9	48.71	39.83
Minimum................	181.7	42.0	14.5	10.1	0.67	0.62
Average.................	206.4	109.6	48.89	40.5	14.41	12.61
Million gallons filtered per acre per run:
Maximum...............	242.61	484.46	534.67	960.72	1,463.35	1,022.27
Minimum................	202.60	135.66	93.79	92.57	19.53	53.32
Average.................	218.58	302.82	326.76	417.23	374.14	361.92
Cubic yards of sand removed per acre at end of each run:
Maximum...............	269	269	672	1,612	2,420	3,360
Minimum................	269	134	101	134	134	101
Average.................	269	213	272	392	583	635
Cubic yards of sand removed per acre per million gallons filtered..........	1.23	0.70	0.83	0.94	1.55	1.72
Average initial loss of head..........	0.07	0.19	0.51	0.78	3.88	5.38
Turbidity, influent:
Maximum...............	120	120	120	120	90	100
Minimum................	2	2	2	2	2	2
Average.................	20	20	21	22	18	19
Turbidity, effluent:
Maximum...............	11	13	17	18	30	30
Minimum................	0	0	0	0	0	0
Average.................	1	1	2	2	4	3
Percentage reduction..........	95.0	95.0	90.5	90.9	77.8	84.3
Bacteria, influent:
Maximum...............	180,000	180,000	180,000	110,000	180,000	37,500
Minimum................	22	20	22	20	25	24
Average.................	4,800	5,100	4,500	4,200	6,900	5,900
Bacteria, effluent:
Maximum...............	4,000	1,300	3,200	5,400	12,800	2,400
Minimum................	2	3	1	1	2	2
Average.................	160	85	110	120	190	180
Percentage,Reduction..........	96.7	98.3	97.6	97.3	97.3	97.0
Number of samples examined for bacillus coli in influent:
10 c.c. ...................	549	478	476	436	325	336
1 c.c. ...................	560	492	486	445	335	342
0.1 c.c. ................	525	459	452	413	318	317
0.01 c.c. ..............	511	443	439	405	308	304
0.001 c.c. ............	500	434	429	394	299	294
Number of samples examined for bacillus coli in effluent:
10 c.c. ...................	512	452	454	404	296	309
1 c.c. ...................	513	454	457	406	299	311
0.1 c.c. ................	480	419	426	383	271	286
0.01 c.c. ..............	478	406	410	367	261	276
0.001 c.c. ............	478	406	410	367	261	276
Number samples positive, influent:
10 c.c. ...................	226	211	201	258	136	152
1 c.c. ...................	127	123	116	108	81	93
0.1 c.c. ................	55	59	54	51	43	42
0.01 c.c. ..............	26	34	33	33	27	25
0.001 c.c. ............	6	6	5	6	3	3
Number samples positive, effluent:
10 c.c. ...................	100	109	134	98	94	106
1 c.c. ...................	51	61	55	56	46	50
0.1 c.c. ................	9	13	16	16	4	13
0.01 c.c. ..............	0	0	0	0	0	0
0.001 c.c. ............	0	0	0	0	0	0
Percentage of samples showing bacillus coli in influent:
10 c.c. ...................	41.2	44.2	42.2	59.2	41.9	45.2
1 c.c. ...................	22.7	25.0	23.9	24.3	24.2	27.2
0.1 c.c. ................	10.5	12.8	11.9	12.3	13.5	13.2
0.01 c.c. ..............	5.1	7.7	7.5	8.2	8.8	8.2
0.001 c.c. ............	1.2	1.4	1.2	1.5	1.0	1.0
Percentage of samples showing bacillus coli in effluent:
10 c.c. ...................	19.5	24.1	29.5	24.2	31.7	34.3
1 c.c. ...................	10.0	13.4	12.0	13.8	15.4	16.1
0.1 c.c. ................	1.9	3.1	3.8	4.2	1.5	4.5
0.01 c.c. ..............	0	0	0	0	0	0
0.001 c.c. ............	0	0	0	0	0	0
Cost per million gallons for sand handling..........	$0.43	$0.25	$0.29	$0.33	$0.54	$0.60
Interest charges at 3%..........	6.85	2.25	1.12	0.73	0.32	0.22
Total..........	7.28	2.50	1.41	1.06	0.86	.82

Coli tests presumptive.