Chemistry, asked by GargiMahashay7880, 10 months ago

The amount of residual chlorine left in treated water is about

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Answered by amitp1234

0

EPA requires all US facilities that treat water to maintain a chlorine residual of no more than 4 parts per million, whether chlorine is used as a primary disinfectant or not. Swimming pool operators generally maintain a chlorine residual of 1 to 3 parts per million.

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