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Social & Preventive Medicine
Minimum recommended dose of "free" residual chlorine in water for routine chlorination (in mg/L)-
0.5 mg/L for a contact period of 1 hr.
0.5 mg/L for a contact period of 1/2 hr.
1.0 mg/L for a contact period of 1 hr.
1.0 mg/L for contact period of 1/2 hr.
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