Question 2053 of 223 · California Water Treatment Operator Exam
Which disinfectant provides a lasting residual in the distribution system?
Exactly one answer is correct.
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Correct answer to question 2053
- D: Chlorine or chloramine
Explanation
UV and ozone are strong primary disinfectants but leave no residual. A chlorine residual helps protect water from recontamination in the pipes.
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