Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
Correct answer: B. 0.2 to 0.3
- A. 0.001 to 0.01
- B. 0.2 to 0.3
- C. 2 to 3
- D. 5 to 10
Explanation
Treated drinking water is generally maintained with about 0.2 to 0.3 mg/L residual chlorine so that disinfection continues through the distribution system. Excessively high chlorine concentrations cause taste, odour, and health concerns.
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