Word: alum
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Dates: during 1930-1939
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After passing through a "haircatcher" which picks up any lint from bathing suits, the water is heated to between 72 and 75 degrees. It next runs through two coagulant pots, of soda ash and alum, which prevent undue acidity. The great work of filtration is done by a tank containing 27 tons of graded Cape May, New Jersey sand, through which the water will seep. Before entering the pool it will be impregnated with chlorine gas, which lends a greenish color. The results are tested twice daily by comparing a test-tube full of water with a graded color chart...
After passing through a "hair-catcher" which will pick up any lint from bathing suits, the water will be heated to between 72 and 75 degrees. It next runs through two coagulant pots, of soda ash and alum. which prevent undue acidity. The great work of filtration is done by a tank containing 27 tons of graded Cape May, New Jersey sand, through which the water will seep. Before entering the pool it will be impregnated with chlorine gas, which lends a greenish color. The results can easily be tested by comparing a test-tube full of water with...