A committee of the Pittsburg Board of Trade, appointed to investigate complaints as to pipe corrosion, reported in 1917 that they were largely due to inferior qualities of pipes and not to the method of water purification employed (slow sand filtration and chlorination).
The effect of chlorination on the plumbo-solvency of water was investigated in 1904 by Houston who found that chlorine, as chloros, in amounts between one and ten parts per million, did not appreciably increase the plumbo-solvent action of either unfiltered or filtered water. Similar results were obtained by the author with the Toronto supply: raw lake water, filtered water, and water treated with 0.25 and 0.50 p.p.m. of chlorine, all dissolved the same quantity of lead in twenty-four hours. The amount in each case was too small to be of any significance.
BIBLIOGRAPHY
[1] Letton. J. Amer. Waterworks Assoc., 1915, 2, 688.
[2] Kienle. J. Amer. Waterworks Assoc., 1915, 2, 690.
[3] Adams. J. Amer. Pub. Health Assoc., 1916, 6, 867.