Study of Bacteriological Methods of Testing and Means of Disinfecting Water with Chlorine

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Abstract
Samples of swimming-pool water collected during periods of use and tested immediately showed more pollution than duplicate samples handled in the usual manner by storing and testing later. During periods of use, swimming-pool water showed marked pollution as measured by colon bacilli and streptococci indexes in presence of residual Cl contents of 0.2-0.5 p.p.m. During periods of rest, the pollution evidenced during use disappeared; rate of disappearance depended on type of treatment. With chloramine treatment, a delayed germicidal action occurred. This was also true of Cl treatment in alkaline water, but to a lesser extent. The colon bacilli and streptococci indexes roughly parallel each other. The preponderance of colon bacilli and streptococci incidences varies. A Na thiosulphate-treated sample bottle is recommended for collecting pool samples.

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