Certified Pool Operator Practice Test: (Newest 2026 / 2027 Update) Comprehensive Test Questions and Verified Answers | 100% Correct | Grade A

Certified Pool Operator Practice Test: (Newest 2026 / 2027 Update) Comprehensive Test Questions and Verified Answers | 100% Correct | Grade A Quiz_________________? 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 Quiz_________________? 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 Quiz_________________? 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 Quiz_________________? 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 Quiz_________________? 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 Quiz_________________? 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 Quiz_________________? The reagent commonly used to test PH is: (A) DPD (B) Sodium Thiosulfate (C) Coolomatic (D) Phenol red - Answer☑️ (D) Phenol red Quiz_________________? 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 Quiz_________________? 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) Quiz_________________? 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. Quiz_________________? 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 - Answer☑️