Page 1 of 106
CPO EXAM LATEST 2024-2025 COMPLETE VERSIONS A, B
& C ALL 500 QUESTIONS AND DETAILED ANSWERS JUST
RELEASED
CPO ACTUAL EXAM A
When mechanical cooling is used on an indoor therapeutic pool facility, the recommended
ASHRAE fresh air exchange rate should be:
(A) 2 to 4 exchanges per hour
(B) 4 to 6 exchanges per hour
(C) 6 to 8 exchanges per hour
(D) As many as possible - ANSWER-(B) 4 to 6 exchanges per hour
What condition mandates an immediate closure of your swimming pool?
(A) Locker room is not clean
(B) Main drain not visible from the deck
(C) No automatic feeders installed
(D) No underwater lights installed - ANSWER-(B) Main drain not visible from the deck
The reagent commonly used to test PH is:
(A) DPD
(B) Sodium Thiosulfate
(C) Coolomatic
(D) Phenol red - ANSWER-(D) Phenol red
1
,Page 2 of 106
When should you backwash high rate sand filters that have a single pressure gauge?
(A) After an 8 to 10 psi increase above starting pressure
(B) Every 2 days
(C) Once per week
(D) When the influent and effluent gauges are 10 to 20 psi apart - ANSWER-(A) After an 8 to 10
psi increase above starting pressure
Oxidation Reduction Potential testing (ORP) is measured in:
(A) Parts per million (ppm)
(B) Millivolts (mV)
(C) Gallons per minute (gpm)
(D) Free available chlorine (FAC) - ANSWER-(B) Millivolts (mV)
How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to 2.0
ppm in a 150,000 gallon pool?
(A) 35 lbs.
(B) 30 lbs.
(C) 25 lbs.
(D) 39 lbs. - ANSWER-(D) 39 lbs.
Evaporation heat losses from a pool are highest under which environmental condition?
(A) High relative humidity
(B) Low relative humidity
(C) Clear sky
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,Page 3 of 106
(D) Low barometric pressure - ANSWER-(B) Low relative humidity
Which type of filter requires the least amount of water to clean?
(A) Diatomaceous
(B) Rapid rate sand
(C) High rate sand
(D) Cartridge - ANSWER-(D) Cartridge
Cyanuric acid (stabilizer) protects free chlorine (FC) against the effects of:
(A) Pathogens like Crypto, Giardia, and Shigella
(B) High Total dissolved solids
(C) Ultraviolet rays from the sun
(D) High PH - ANSWER-(C) Ultraviolet rays from the sun
An erosion chemical feeder is what type of feeder?
(A) Peristaltic pump
(B) Piston pump
(C) Dry chemical feeder
(D) Gas system - ANSWER-(C) Dry chemical feeder
OSHA requires aquatic facilities to maintain:
(A) Safety Data Sheets only for sanitizing chemicals
(B) Lifeguard certifications
(C) Air temperature recordings
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, Page 4 of 106
(D) SDS's for all chemicals used at the facility - ANSWER-(D) SDS's for all chemicals used at the
facility
The daily opening checklist should be used to:
(A) Check the design of the facility
(B) Ensure all safety equipment is in place
(C) Check that all ground wires are properly connected
(D) Ensure the heater is properly sized - ANSWER-(B) Ensure all safety equipment is in place
You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How much
calcium chloride (77%) would be required to increase this to 250 ppm?
(A) 20 lbs.
(B) 25 lbs.
(C) 18 lbs.
(D) 24 lbs. - ANSWER-(D) 24 lbs.
Which chemical is sued to lower the pH value of pool or spa water?
(A) Sodium bicarbonate
(B) Fresh water
(C) Sodium bisulfate
(D) Calcium chloride - ANSWER-(C) Sodium bisulfate
In a circulation system, the commonly accepted practice is to have:
4
CPO EXAM LATEST 2024-2025 COMPLETE VERSIONS A, B
& C ALL 500 QUESTIONS AND DETAILED ANSWERS JUST
RELEASED
CPO ACTUAL EXAM A
When mechanical cooling is used on an indoor therapeutic pool facility, the recommended
ASHRAE fresh air exchange rate should be:
(A) 2 to 4 exchanges per hour
(B) 4 to 6 exchanges per hour
(C) 6 to 8 exchanges per hour
(D) As many as possible - ANSWER-(B) 4 to 6 exchanges per hour
What condition mandates an immediate closure of your swimming pool?
(A) Locker room is not clean
(B) Main drain not visible from the deck
(C) No automatic feeders installed
(D) No underwater lights installed - ANSWER-(B) Main drain not visible from the deck
The reagent commonly used to test PH is:
(A) DPD
(B) Sodium Thiosulfate
(C) Coolomatic
(D) Phenol red - ANSWER-(D) Phenol red
1
,Page 2 of 106
When should you backwash high rate sand filters that have a single pressure gauge?
(A) After an 8 to 10 psi increase above starting pressure
(B) Every 2 days
(C) Once per week
(D) When the influent and effluent gauges are 10 to 20 psi apart - ANSWER-(A) After an 8 to 10
psi increase above starting pressure
Oxidation Reduction Potential testing (ORP) is measured in:
(A) Parts per million (ppm)
(B) Millivolts (mV)
(C) Gallons per minute (gpm)
(D) Free available chlorine (FAC) - ANSWER-(B) Millivolts (mV)
How much sodium thiosulfate would you need to lower the free chlorine from 18 ppm to 2.0
ppm in a 150,000 gallon pool?
(A) 35 lbs.
(B) 30 lbs.
(C) 25 lbs.
(D) 39 lbs. - ANSWER-(D) 39 lbs.
Evaporation heat losses from a pool are highest under which environmental condition?
(A) High relative humidity
(B) Low relative humidity
(C) Clear sky
2
,Page 3 of 106
(D) Low barometric pressure - ANSWER-(B) Low relative humidity
Which type of filter requires the least amount of water to clean?
(A) Diatomaceous
(B) Rapid rate sand
(C) High rate sand
(D) Cartridge - ANSWER-(D) Cartridge
Cyanuric acid (stabilizer) protects free chlorine (FC) against the effects of:
(A) Pathogens like Crypto, Giardia, and Shigella
(B) High Total dissolved solids
(C) Ultraviolet rays from the sun
(D) High PH - ANSWER-(C) Ultraviolet rays from the sun
An erosion chemical feeder is what type of feeder?
(A) Peristaltic pump
(B) Piston pump
(C) Dry chemical feeder
(D) Gas system - ANSWER-(C) Dry chemical feeder
OSHA requires aquatic facilities to maintain:
(A) Safety Data Sheets only for sanitizing chemicals
(B) Lifeguard certifications
(C) Air temperature recordings
3
, Page 4 of 106
(D) SDS's for all chemicals used at the facility - ANSWER-(D) SDS's for all chemicals used at the
facility
The daily opening checklist should be used to:
(A) Check the design of the facility
(B) Ensure all safety equipment is in place
(C) Check that all ground wires are properly connected
(D) Ensure the heater is properly sized - ANSWER-(B) Ensure all safety equipment is in place
You have a 25,000 gallon hotel pool with a calcium hardness level of 170 ppm. How much
calcium chloride (77%) would be required to increase this to 250 ppm?
(A) 20 lbs.
(B) 25 lbs.
(C) 18 lbs.
(D) 24 lbs. - ANSWER-(D) 24 lbs.
Which chemical is sued to lower the pH value of pool or spa water?
(A) Sodium bicarbonate
(B) Fresh water
(C) Sodium bisulfate
(D) Calcium chloride - ANSWER-(C) Sodium bisulfate
In a circulation system, the commonly accepted practice is to have:
4
