Social & Preventive Medicine FMGE 2018 948cf210 Value of free residual chlorine in Drinking water should be: A 0.2 mg/L B 0.3 mg/L C 0.4 mg/L D 0.5 mg/L High-Yield Explanation It's should be minimum 0.5 mg/l (ppm) in drink water >= 1.0 mg /l swimming pool >=2.0 mg/l kill cyclops Measured by chloroscope