How to calculate the dose of sodium hypochlorite to be added to 4 lakhs litre of water at 0.5ppm and 1ppm?
India Water Portal team
How to calculate the dose of sodium hypochlorite to be added to 4 lakhs liter of water at 0.5ppm and 1ppm? So that, at the end user should get 0.2 free residual chlorine, any formula in this regard?