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In the Federal Republic of Germany, the choice of the indicator differs with the water that has to be examined. For drinking water, the classical parameters are the total colony count and the Escherichia coli test.
While the colony count seems to be considered of less importance in other European countries, the German legislation contains mandatory limits. Furthermore, E. coli must not be present in 100 ml of drinking water. Fecal streptococci and Pseudomonas aeruginosa are good indicators for the examination of swimming water in pools which have been treated by flocculation, filtration, and chlorination.
bacteria, water, coliform bacteria, colony count, cholera, typhoid fever, incubation conditions, sewage, swimming pools
Professor, Bundesgesundheitsamt, Institut for Wasser, Boden u. Luft Hygiene, Corrensplatz,