CPO Actual Exam Questions With 100%
Verified Answers Latest Versions 2025
Graded A+
You operate a pool which uses high rate sand filters. You discover that
your filter tank has developed a major leak and must be replaced. Your
pool operates with a flow rate of 625 gmp. Using a filter media t=rate (fmr)
of 12 gallons per minute, what size sand filter would you need to replace
your damaged filter?
(A) 50 sq. ft.
(B) 36 sq. ft.
(C) 38 sq. ft.
(D) 52 sq. ft - Correct Answer-(D) 52 sq. ft
What is the best practice to prevent algae growth?
(A) Raise the pH
(B) Routinely brush pool and spa walls
(C) Increase pool water temperature
(D) Use UV as a supplement - Correct Answer-(B) Routinely brush pool
and spa walls
1 | Page
,The presence of galvanic corrosion in water is signaled by:
(A) Discoloration of metal parts submerged in water
(B) TDS level 1,500 ppm higher than make-up water TDS level
(C) Saturation index less than -0.3
(D) Water tinted blue - Correct Answer-(A) Discoloration of metal parts
submerged in water
If there is a diarrheal incident in your pool, according to the Centers for
Disease Control and Prevention (CDC), you must raise the free chlorine
level to 20 ppm and keep it there for:
(A) 12.75 hours
(B) 45 minutes
(C) 25.55 hours
(D) 17.00 hours - Correct Answer-(A) 12.75 hours
Which chemical could be added to lower the chlorine level in the water?
(A) Calcium chloride
(B) Sodium thiosulfate
(C) Sodium sesquicarbonate
(D) Cyanuric Acid - Correct Answer-(B) Sodium thiosulfate
At your swimming pool, failure to provide the appropriate standard of care
to the public can lead to a case of:
(A) Negligence
2 | Page
, (B) Failure to meet objectives
(C) Performance evaluation
(D) Loss of CPO certification - Correct Answer-(A) Negligence
To reduce the possibility of suction entrapment an operator should:
(A) Use approved main drain covers
(B) Install check valves
(C) Use a flow meter
(D) Use an automatic chemical feeder - Correct Answer-(A) Use approved
main drain covers
Which type of filter requires the least amount of water to clean?
(A) Diatomaceous
(B) Rapid rate sand
(C) High rate sand
(D) Cartridge - Correct 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 - Correct Answer-(C) Ultraviolet rays from the sun
3 | Page
Verified Answers Latest Versions 2025
Graded A+
You operate a pool which uses high rate sand filters. You discover that
your filter tank has developed a major leak and must be replaced. Your
pool operates with a flow rate of 625 gmp. Using a filter media t=rate (fmr)
of 12 gallons per minute, what size sand filter would you need to replace
your damaged filter?
(A) 50 sq. ft.
(B) 36 sq. ft.
(C) 38 sq. ft.
(D) 52 sq. ft - Correct Answer-(D) 52 sq. ft
What is the best practice to prevent algae growth?
(A) Raise the pH
(B) Routinely brush pool and spa walls
(C) Increase pool water temperature
(D) Use UV as a supplement - Correct Answer-(B) Routinely brush pool
and spa walls
1 | Page
,The presence of galvanic corrosion in water is signaled by:
(A) Discoloration of metal parts submerged in water
(B) TDS level 1,500 ppm higher than make-up water TDS level
(C) Saturation index less than -0.3
(D) Water tinted blue - Correct Answer-(A) Discoloration of metal parts
submerged in water
If there is a diarrheal incident in your pool, according to the Centers for
Disease Control and Prevention (CDC), you must raise the free chlorine
level to 20 ppm and keep it there for:
(A) 12.75 hours
(B) 45 minutes
(C) 25.55 hours
(D) 17.00 hours - Correct Answer-(A) 12.75 hours
Which chemical could be added to lower the chlorine level in the water?
(A) Calcium chloride
(B) Sodium thiosulfate
(C) Sodium sesquicarbonate
(D) Cyanuric Acid - Correct Answer-(B) Sodium thiosulfate
At your swimming pool, failure to provide the appropriate standard of care
to the public can lead to a case of:
(A) Negligence
2 | Page
, (B) Failure to meet objectives
(C) Performance evaluation
(D) Loss of CPO certification - Correct Answer-(A) Negligence
To reduce the possibility of suction entrapment an operator should:
(A) Use approved main drain covers
(B) Install check valves
(C) Use a flow meter
(D) Use an automatic chemical feeder - Correct Answer-(A) Use approved
main drain covers
Which type of filter requires the least amount of water to clean?
(A) Diatomaceous
(B) Rapid rate sand
(C) High rate sand
(D) Cartridge - Correct 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 - Correct Answer-(C) Ultraviolet rays from the sun
3 | Page
