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What is the requered contact time for chlorine to kill E. coli?
Wiki User
∙ 10y ago
Chlorine rapidly kills E coli bacteria. At a concentration of 1 part per million (the minimum level recommended for swimming pools), chlorine kills E coli in less than one minute. At 200 parts per million (about one tablespoon of household bleach in a gallon of water) the kill time would be less than a second.
See the Centers for Disease Control and Prevention website: http://www.cdc.gov/healthyswimming/chlorine_timetable.htm
Wiki User
∙ 10y ago
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