SC Swimming Pool Practice Questions - South Carolina Swimming Pool Contractor Examination Exam

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A pool test reads 1.5 ppm free chlorine and 2.0 ppm total chlorine. Using the CPO 10× rule, how many additional ppm of free chlorine must be added to reach breakpoint?

0.5 ppm 1.5 ppm 3.5 ppm 20.0 ppm

Correct Answer:

3.5 ppm

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