Minimum recommended concentration of free chlorine drinking water at the end of 1 hour is -
The minimum recommended level of residual chlorine is 0.5 mg/L. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 774
0.5 mg/L
0.1 mg/L
1.0 mg/L
1.5 mg/L
Environment and health