A. Contact period -30 minutes
B. Free chlorine 0.5 mg/liter from one hour
C. Water should not be turbid
D. Chlorine demand should be estimated
Following is true regarding chlorination, except?
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A. Contact period -30 minutes
B. Free chlorine 0.5 mg/liter from one hour
C. Water should not be turbid
D. Chlorine demand should be estimated
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