Question 5007 of 223 · California Water Treatment Operator Exam
A 3-log reduction of Giardia corresponds to a removal or inactivation of
Exactly one answer is correct.
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Correct answer to question 5007
- D: 99.9 percent
Explanation
Each log is a factor of 10: 1-log = 90 percent, 2-log = 99 percent, 3-log = 99.9 percent, 4-log = 99.99 percent.
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