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Chemical disinfection/Free chlorine

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Free chlorine does the hard work of killing bacteria and oxidizing contaminants. When you add chlorine to water, you are actually adding free chlorine. When the free chlorine combines with contaminants, it becomes combined chlorine, or chloramines. In water, this form of chlorine has very little sanitizing ability, and no oxidizing ability. Total chlorine is just the sum of both combined chlorine and free chlorine.

Chlorine is a versatile and low-cost disinfectant appropriate for any size water system, whether it serves chlorine can also be used for treating water in individual households. Specially-packaged chlorine bleach can disinfect household water for less than US$ 4/year per family.

[[File:free chlorine chart.jpg]]

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