Pool Maintenance and Troubleshooting Questions and Answers Flashcards

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

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

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

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

Answer: Poor circulation creating dead spots where sanitizer levels drop

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

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

Answer: Inadequate water flow through the heater or a dirty filter

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

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

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

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

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

Answer: Recognize this indicates high chloramine levels and perform breakpoint chlorination

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

A pool operator discovers brown stains spreading on the pool plaster. What is the most likely cause?

Answer: Iron contamination from well water or corroding metal components

Brown or rust-colored stains typically indicate iron in the water from well water fill, corroding pipes, or degrading rebar.