CPO TEST LATEST 2026 ACTUAL EXAM 350 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

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CERTIFIED POOL OPERATOR (CPO)

CERTIFICATION EXAM LATEST QUESTIONS AND

ANSWERS (VERIFIED ANSWERS) |ALREADY

GRADED A+

You are the CPO for a 100 foot long, 50 foot wide country club pool. The average depth of this pool is 7 feet. You return to the pool on Monday morning, after a rare weekend off, and find that the auto-fill feature has failed to work, and the pool water level is four inches too low. How many gallons of water must be added to return the water to the proper level?

• 120,480 gallons
• 3,123 gallons
• 12,495 gallons
• 15,000 gallons

Correct Answer: C. 12,495 gallons

You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per day. According to the CPO Handbook, how often should the water in this spa be changed?

• 20 days
• 10 days
• 100 days
• 1 day

Correct Answer: B. 10 days

You are the CPO for a large municipal swimming pool. This pool has a volume of 560,000 gallons of water, and has an average daily bather load of 1300

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people. The pool is operated using high rate pressure sand filters. How often should you backwash the filters?

• Once per week
• Every 168 hours
• When the influent and effluent gauges are 10 to 20 psi apart
• Whenever the pool manager tells you to

Correct Answer: C. When the influent and effluent gauges are 10 to 20 psi apart

In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over

OTO because:

• OTO bleaches out at high levels of chlorine
• DPD has a pleasant pink color
• OTO only tests for Total Chlorine
• DPD smells funny

Correct Answer: C. OTO only tests for Total Chlorine

Safety and rescue equipment should always be:

• Kept easily accessible around the pool
• Kept safely stored inside a locked room
• Kept near the wading pool at all times
• Kept in the pool manager's office

Correct Answer: A. Kept easily accessible around the pool

Which type of filter system will remove the smallest micron particles?

• Rapid rate sand
• Cartridge
• Diatomaceous earth

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• High rate sand

Correct Answer: C. Diatomaceous earth

If the pump fails to prime, which of the following does not have to be checked?

• Leak on suction side of the pump
• Hair and lint cover is loose or has a worn O-ring
• Clogged skimmer basket
• Filter system pressure is too high

Correct Answer: D. Filter system pressure is too high

Oxidation Reduction Potential testing (ORP) is measured in?

• mV

B. PPM

C. GPM

D. FAC

Correct Answer: A. mV

High calcium hardness can result in what condition?

• Etching of pool surface
• Heater failure
• Staining
• Cloudy water

Correct Answer: D. Cloudy water

Head first entry dives are:

• Only important in pools greater than 5 feet deep

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• Allowed only when patrons are young and athletic, never by very young or

very old patrons

• Only allowed in areas of the pool that are not marked as 'NO DIVING'
• Not taught to the public anymore due to the extreme danger they present

Correct Answer: C. Only allowed in areas of the pool that are not marked as

'NO DIVING'

Opening and closing checklists:

• Help note unsafe conditions at a facility
• Should include a check of the main drain cover
• Will ensure proper deck clearance is maintained around the pool edge
• All of the above

Correct Answer: D. All of the above

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

• True
• False
• Maybe
• Depends on the pH of the water

Correct Answer: B. False

Channeling of filters occurs when:

• There is a leak in the filter
• The FMR is exceeded, and water cuts a channel through the media
• The water overflows in a filter
• All of the above