Certified Pool Operator Practice Test

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Upon having a fecal incident with solid stool in a 120,000-gallon pool, what should be the immediate action according to the Centers for Disease Control?

  1. Clear the pool and raise the free chlorine to 2 ppm

  2. Add algaecide to the pool

  3. Increase the water temperature

  4. Lower the pH to 6.5

The correct answer is: Clear the pool and raise the free chlorine to 2 ppm

When there is a fecal incident in a pool, it is important to immediately clear the pool and raise the free chlorine level to 2 ppm according to the Centers for Disease Control (CDC). This is because chlorine is a disinfectant and raising the level will kill any germs from the stool. Adding algaecide (B) or increasing the water temperature (C) will not effectively disinfect the pool. Lowering the pH to 6.5 (D) can also be counterproductive as it can potentially decrease the effectiveness of chlorine in killing germs. Therefore, the immediate action suggested by the CDC is to clear the pool and raise the free chlorine level to 2 ppm.

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