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INCE the adoption of continuous feed chlorination of swimming pool water whereby residual chlorine contents of 0.2 to 0.5 p.p.m. may be maintained irrespective of the bathing load, bacterial quality comparable to drinking water has been obtained. In 1926, Stovall, Nichols, and Vincent 1 reported that the relationship between the bacterial purity of the water and the residual chlorine content as measured by the orthotolidine test was so satisfactory that this test could be depended upon as a measurement of sanitary quality. In the same year Mallmann2 observed such a close agreement in the bacteriological and the orthotolidine tests that he recommended the latter as the sole measurement of the sanitary quality of swimming pool water. Since then numerous reports have appeared showing the absence of Esckerickia coli in 50 c.c. of water in swimming pools maintaining a residual chlorine content of 0. 2 to 0. 5 p.p.m. There has been no occasion to question the reliability of these data, until-recently in a series of studies on swimming pools, the writers had occasion to test swimming pool water immediately after it was withdrawn from the pool. In 1930, Schoepfle 3 reported that pool side bacteriological tests and tests on the same stored samples tested later at the laboratory were practically the same. He concluded that the increment of pollution to the pool water due to swimmers seemed to be handled effectively by maintaining the residual chlorine within proper limits;

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