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December 27, 1919


JAMA. 1919;73(26):1940. doi:10.1001/jama.1919.02610520030017

The chlorination of water supplies is probably the most important contribution made by this country to the art of water purification. In fact, this process stands out as the most useful procedure yet devised for insuring the safety of a municipal water supply. The results that could be achieved by adding calcium hypochlorite to water were first demonstrated in some experiments by G. A. Johnson at the Union Stock Yards in Chicago. Immediate publicity was given to this work by the treatment of the Jersey City supply at Boonton and the celebrated lawsuit that followed. The next few years witnessed a rapid development in the installation of plants using calcium hypochlorite, approximately 500 of these being in operation at the end of 1911. Disadvantages in the use of the lime salt soon appeared, due primarily to the lack of uniformity in the strength of the commercial product and also to