CPO Practice Exam Actual Questions and Answers (2024 / 2025) (Verified Answers)

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 ANS (D) Cartridge 2. 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 ANS (C) Ultraviolet rays from the sun 3. An erosion chemical feeder is what type of feeder? (A) Peristaltic pump (B) Piston pump (C) Dry chemical feeder (D) Gas system ANS (C) Dry chemical feeder 4. 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 ANS (D) SDS's for all chemicals used at the facility