Which one of the following is the level of residual free chlorine recommended for swimming pool water disinfection?
Correct Answer: 1 mg/litre
Description: 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
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Social & Preventive Medicine
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