Certified Pool Operator's Final Exam 2024/2025 questions with 100% correct answers

The percentage of hypoclorous acid formation is most influenced by: - ANSWERS pH Pool painting is usually done: - ANSWERS Before opening in the spring When a pool is chlorinated with gas chlorine, the operator must also use: - ANSWERS Soda Ash The term "chlorine demand" refers to: - ANSWERS The amount of chlorine which will react with substances in the pool Re-circulation pumps used in swimming pools are the type called: - ANSWERS Centrifugal pumps Reversing the flow of water through the filters is called: - ANSWERS Backwash "Slurry feed" or "body feed" refers to: - ANSWERS Diatomite added during a filter run The term pH is determined by the concentration of: - ANSWERS Hydrogen ions Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to: - ANSWERS Rise When enough chlorine is added to cause complete oxidation of all organic compounds, a sudden drop in residual chlorine may be noticed. The point at which this occurs is called the: - ANSWERS Break-point "Residual chlorine" refers to: - ANSWERS The amount left in the water after oxidation of organic material Which of the following is NOT considered a swimming pool disinfectant: - ANSWERS Chlorinated hydrocarbons When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant properties are the greatest is: - ANSWERS Hypochlorous acid The chemical most commonly used to raise pH is: - ANSWERS Sodium carbonate An example of a chemical used to stabilize chlorine is: - ANSWERS Cyanuric acid The chemical reagent recommended by the health department to test chlorine residual in swimming pools is: - ANSWERS D.P.D.