CPO Filtration and Circulation Systems 3

Question 1

What is the recommended flow rate range for sand filters used in commercial pools?

Accepted Answer

3–5 gallons per minute per square foot

Answer

Sand filters for commercial pools operate at a flow rate of 3–5 gallons per minute per square foot of filter surface area.

Question 2

After backwashing a sand filter, what position should the multiport valve be set to before returning to filter mode?

Accepted Answer

Rinse

Answer

After backwashing, the valve should be set to the Rinse position for about 30–60 seconds to reseat the sand and clear any debris from the laterals before returning to Filter.

Question 3

The turnover rate for a wading pool or kiddie pool is typically:

Accepted Answer

Every 2 hours or less

Answer

Wading or kiddie pools require a faster turnover — typically every 1–2 hours — due to higher bather load relative to volume and greater contamination risk.

Question 4

Which of the following best describes the function of the skimmer weir?

Accepted Answer

It regulates the flow of surface water into the skimmer

Answer

The skimmer weir is a floating flap that regulates the flow of surface water into the skimmer, maximizing removal of oils and debris from the water surface.

Question 5

What is cavitation in a pool pump?

Accepted Answer

Formation and collapse of vapor bubbles due to low suction pressure

Answer

Cavitation occurs when low suction pressure causes water to vaporize, forming bubbles that collapse violently and damage the pump impeller.

CPO (Certified Pool Operator Exam) Practice Test

CPO (Certified Pool Operator Exam) Practice Test

CPO Filtration and Circulation Systems 3