Fig. 342.
Fig. 343.
Fig. 344.
Fig. 345.
Fig. 346.
Messrs. Stiff & Sons produce a large number of filters of excellent construction and of artistic design. Some of these have Gothic arches, with figures or armorial decorations, and others are decorated with elegant foliage; two of these effective designs are shown on Figs. [343] and [344]. These filters have been more than thirty years before the public. The filtering medium consists of alternate layers of charcoal, silica, and another purifying substance, all carefully cleansed, and so arranged as to retain full efficiency for eight or ten years without further cost or trouble. The “Popular” filter—intended for common use among all classes—purifies eight gallons of water per day, and is sold complete and fitted for a mere trifle.