Which one of the following is the level of residual free chlorine recommended for swimming pool water disinfection?
Chlorination is the most widely used method of pool disinfection. Various workers have stated that continuous maintenance of 1mg/litre(1ppm) of free residual chlorine provides adequate protection against bacterial and viral agents. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 788
0.5 mg/litre
0.8 mg/litre
1 mg/litre
5 mg/litre
Environment and health