system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
False statement regarding chlorination of water:
assistant
The correct answer is  (Refer: K. Park’s Textbook of Preventive and Social medicine, 24th edition, pg no: 765, 766)
Recommended minimum contact period is 1 hour for chlorination
Principles of chlorination

Water should be clear, turbid free
Chlorine demand should be estimated, which is the amount of chlorine needed to destroy bacteria, oxidize all organic matter, neutralise all ammoniacal substances in water
Breakpoint chlorination – The point a which chlorine demand of the water is met Free chlorine begins to appear in water, if further chlorine is added beyond breakpoint
Recommended minimum  contact period is 1 hour for chlorination
Recommended Residual chlorine for drinking water is 0.5 mg / litre
For water bodies, post disaster – 0.7 mg / litre
For swimming pool sanitation, it is 1.0 mg/ litre