TECHNICAL NOTES ON DRINKING-WATER, SANITATION AND …
Measuring chlorine levels in water supplies The turbidity and the acidity (pH) of the water have a significant effect on the efficiency of chlorine as a disinfectant. The turbidity should be < 5NTU and the pH level between 7.2 and 6.8. See Technical Note 1 for advice on how to change the pH level of water and measure turbidity.
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