In order to achieve similar disinfection, combined chlorine residual must be greater than free chlorine by how many times under favorable conditions?

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Multiple Choice

In order to achieve similar disinfection, combined chlorine residual must be greater than free chlorine by how many times under favorable conditions?

Explanation:
Free chlorine is a much stronger disinfectant than combined chlorine (chloramines). Because chloramines work more slowly and are less reactive, you must use a much higher residual to match the disinfection effect of free chlorine. Under favorable conditions, the combined chlorine residual needs to be about 25 times the free chlorine residual to achieve similar disinfection. The other smaller multipliers wouldn’t provide enough disinfection strength.

Free chlorine is a much stronger disinfectant than combined chlorine (chloramines). Because chloramines work more slowly and are less reactive, you must use a much higher residual to match the disinfection effect of free chlorine. Under favorable conditions, the combined chlorine residual needs to be about 25 times the free chlorine residual to achieve similar disinfection. The other smaller multipliers wouldn’t provide enough disinfection strength.

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