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3-5 ppm should be maintain to kill micro organism, it also depends upon the water suspended solids level. if ss more it will consume more chlorine due chlorine break-point. so do some jar test and then fix it.
But final water before discharge should be less than0.5 ppm.
-1-2 ppm is adequate for baterial disinfection
- Residual chlorine is to be not more than0.1-0.2 ppm
from 0.1: 0.1.5 mg / l
