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American Public Health artificial pools athlete's foot bacteriologic conditions bathhouses bathing areas bathing beaches bathing loads bathing waters bottles bromine cent chemical chloramine chlorine residuals circulation clean coliform index coliform organisms committee danger diatomaceous earth filters dilution dirt disease diving board diving platforms dressing rooms electrical conductors Electrical Safety entering the pool equipment feet flowing-through pool foot inches indoor pools infections inlet installed leptospirosis lifeguards located minimum National Electrical Code number of bathers operating outdoor bathing places outdoor pools outlets overflow gutters permit piping pool area Pools and Bathing present pressure filters probable numbers public bathing places Public Health Association pump suction recirculation or flowing-through recirculation system recom recommended residual chlorine runways samples sanitary engineers sanitary survey satisfactory Section sewage pollution shower sodium thiosulfate standards suction cleaner suits and towels swimmer swimmer's itch swimming pool disinfection swimming pool water tests tion toilets wash water