Abstract
The filter runs are terminated at 48 hours throughout the year. In times of heavy run off from the watershed this is probably the limit of the run. In the summer the runs could be extended to 72 hours, but we believe that the floe accumulation on the surface of the sand after it has been held for this long time will tend to cause a slight taste in the water. The effluent from each filter is made visible to the operators by means of small white enamelled basins through which a small quantity of the filtered water is constantly passing. The bottom of these basins is a plate glass mirror. They are located directly below the operating tables and are inspected through on opening in the table top. They give a very sensitive indication of the turbidity of the water. They are not shown to the ordinary visitors, since the presence of a very minute quantity of turbidity that would not prevent the view of the bottom of the clear well through 13 feet of water will appear in the basins as a quite perceptible cloudiness. After filtration the water receives the second dose of chlorine of from 0.3 to 0.4 p.p.m. and is then passed to the clear well for distribution to the mains. The new plant was designed by Messrs. Gore, Nasmith and Storrie of Toronto, and was constructed under the supervision of the writer. The contractors are to be congratulated on the excellence of their workmanship.
Published Version
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