CERTIFIED POOL OPERATOR UPDATED ACTUAL EXAM QUESTIONS CORRECT ANSWERS GRADED A PLUS

CERTIFIED POOL OPERATOR UPDATED ACTUAL EXAM QUESTIONS CORRECT
ANSWERS GRADED A PLUS
Certified Pool Operator Questions and Answers
Verified Solutions Latest Update 2026/2027

Question:
18. Oxidation Reduction Potential testing (ORP) is measured in?

Answer:
mV



Question:
19. High calcium hardness can result in what condition?

Answer:
cloudy water



Question:
20. Head first entry dives are:

Answer:
only allowed in areas of the pool that are not marked as 'NO DIVING'



Question:
21. Opening and closing checklists:

Answer:
all of the above



Question:
22. You can become sick from ingesting water infected with Legionella bacteria

Answer:

, false



Question:
23. Channeling of filters occurs when:

Answer:
the FMR is exceeded, and water cuts a channel through the media



Question:
24. The only physical factor that affects water balance is:

Answer:
temperature



Question:
25. To be classified as a disinfectant, a compound must kill or inactivate 99.9% of contaminants as
well as:

Answer:
leave a measurable residual in the water



Question:
26. Pools using chlorine gas as a disinfectant produce hydrochloric acid, which can be neutralized
with:

Answer:
caustic soda or soda ash



Question:
27. When balancing swimming pool water, the following should be adjusted first:

Answer: