CPO Pool Maintenance and Troubleshooting Questions and Answers 3

Question 1

A pool operator notices bubbling at the return inlets and the pump strainer is half full of air. What should be checked first?

Accepted Answer

The pump lid O-ring, suction-side fittings, and water level

Answer

Air in the system indicates a suction-side air leak. Check the pump lid O-ring, suction-side fittings, and water level.

Question 2

What is the primary cause of algae growth in a properly chlorinated pool?

Accepted Answer

Poor circulation creating dead spots where sanitizer levels drop

Answer

Even with adequate chlorine readings at the test point, poor circulation creates areas where sanitizer is depleted, allowing algae to establish.

Question 3

A pool heater is cycling on and off rapidly. What is the most likely cause?

Accepted Answer

Inadequate water flow through the heater or a dirty filter

Answer

Short cycling is typically caused by insufficient water flow, which triggers the high-limit safety switch.

Question 4

What is the correct procedure for winterizing an outdoor pool in a freeze-prone climate?

Accepted Answer

Lower water level, drain equipment and piping, add winterizing chemicals, and install a safety cover

Answer

Proper winterization includes lowering water level, blowing out and draining all piping and equipment, adding winterizing chemicals, and securing a safety cover.

Question 5

What should a CPO do when the pool water has a strong chlorine odor but the free chlorine test reads low?

Accepted Answer

Recognize this indicates high chloramine levels and perform breakpoint chlorination

Answer

A strong chlorine smell with low free chlorine indicates high combined chlorine (chloramines). The smell comes from chloramines, not free chlorine.

CPO (Certified Pool Operator Exam) Practice Test

CPO (Certified Pool Operator Exam) Practice Test

CPO Pool Maintenance and Troubleshooting Questions and Answers 3