CPO Practice EXAM 2027 Newest Version Actual Questions and
Answers 100% Correct (A+)
Question 1.
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
-✓✓(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 -✓✓(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 (D) SDS's for all chemicals used
at the facility -✓✓(D) SDS's for all chemicals used at the facility 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 -✓✓(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 -✓✓(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 -✓✓(D) Phenol red 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 -✓✓(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) -✓✓(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. -✓✓(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 (D) Low barometric pressure -✓✓(B) Low
relative humidity 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 -✓✓(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. -✓✓(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 -✓✓(C) Sodium bisulfate In a circulation
system, the commonly accepted practice is to have: (A) 75% of the water
return from the main drain (B) 50%of the water return via the main drain and
Answers 100% Correct (A+)
Question 1.
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
-✓✓(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 -✓✓(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 (D) SDS's for all chemicals used
at the facility -✓✓(D) SDS's for all chemicals used at the facility 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 -✓✓(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 -✓✓(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 -✓✓(D) Phenol red 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 -✓✓(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) -✓✓(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. -✓✓(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 (D) Low barometric pressure -✓✓(B) Low
relative humidity 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 -✓✓(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. -✓✓(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 -✓✓(C) Sodium bisulfate In a circulation
system, the commonly accepted practice is to have: (A) 75% of the water
return from the main drain (B) 50%of the water return via the main drain and
