CPO FINAL PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◉ 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
,(D) SDS's for all chemicals used at the facility. Answer: (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. 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
, ◉ 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.
ANSWERS GRADED A+
◉ 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
,(D) SDS's for all chemicals used at the facility. Answer: (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. 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
, ◉ 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.
