Pool Operator's Final Exam With 77
Questions and answers Updated 2025/26
The percentage of hypoclorous acid formation is most influenced by: - Correct Answers pH
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Pool painting is usually done: - Correct Answers Before opening in the spring
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! When a pool is chlorinated with gas chlorine, the operator must also use: - Correct Answers Soda Ash
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The term "chlorine demand" refers to: - Correct Answers The amount of chlorine which will react with
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! substances in the pool II! II! II!
II! Re-circulation pumps used in swimming pools are the type called: - Correct Answers Centrifugal pumps
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Reversing the flow of water through the filters is called: - Correct Answers Backwash
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! "Slurry feed" or "body feed" refers to: - Correct Answers Diatomite added during a filter run
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The term pH is determined by the concentration of: - Correct Answers Hydrogen ions
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to: - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers Rise II! II! II! II!
When enough chlorine is added to cause complete oxidation of all organic compounds, a sudden drop in
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
residual chlorine may be noticed. The point at which this occurs is called the: - Correct Answers Break-
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
point
II! "Residual chlorine" refers to: - Correct Answers The amount left in the water after oxidation of organic
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! material
, II! Which of the following is NOT considered a swimming pool disinfectant: - Correct Answers Chlorinated
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! hydrocarbons
II! When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant properties
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! are the greatest is: - Correct Answers Hypochlorous acid
II! II! II! II! II! II! II! II! II! II! II! II!
II! The chemical most commonly used to raise pH is: - Correct Answers Sodium carbonate
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! An example of a chemical used to stabilize chlorine is: - Correct Answers Cyanuric acid
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The chemical reagent recommended by the health department to test chlorine residual in swimming
II! II! II! II! II! II! II! II! II! II! II! II! II!
II! pools is: - Correct Answers D.P.D.II! II! II! II! II! II! II! II! II!
II! The chemical reagent used most often to test pH in swimming pools is: - Correct Answers Phenol red
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Considering all factors, which of the following would be the BEST range for pH in a swimming pool: -
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Correct Answers 7.2-7.8 II! II! II! II! II!
II! The minimum turnover rate to obtain 100% clarity in a pool is: - Correct Answers Once in eight hours
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! There is a noticeable odor of chlorine around your pool and bathers are complaining of eye irritation.
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Which of the following is most likely to solve the problem: - Correct Answers Break point chlorination
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! As pH increases, chlorine effectiveness: - Correct Answers Decreases
II! II! II! II! II! II! II! II! II! II! II! II!
II! In a high-rate sand filter system, the tanks are backwashed: - Correct Answers All at once
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The baffle in the filter tank is there to: - Correct Answers Disperse water evenly over the surface of the
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! filter media II!
Questions and answers Updated 2025/26
The percentage of hypoclorous acid formation is most influenced by: - Correct Answers pH
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Pool painting is usually done: - Correct Answers Before opening in the spring
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! When a pool is chlorinated with gas chlorine, the operator must also use: - Correct Answers Soda Ash
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The term "chlorine demand" refers to: - Correct Answers The amount of chlorine which will react with
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! substances in the pool II! II! II!
II! Re-circulation pumps used in swimming pools are the type called: - Correct Answers Centrifugal pumps
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Reversing the flow of water through the filters is called: - Correct Answers Backwash
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! "Slurry feed" or "body feed" refers to: - Correct Answers Diatomite added during a filter run
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The term pH is determined by the concentration of: - Correct Answers Hydrogen ions
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to: - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers Rise II! II! II! II!
When enough chlorine is added to cause complete oxidation of all organic compounds, a sudden drop in
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
residual chlorine may be noticed. The point at which this occurs is called the: - Correct Answers Break-
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
point
II! "Residual chlorine" refers to: - Correct Answers The amount left in the water after oxidation of organic
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! material
, II! Which of the following is NOT considered a swimming pool disinfectant: - Correct Answers Chlorinated
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! hydrocarbons
II! When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant properties
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! are the greatest is: - Correct Answers Hypochlorous acid
II! II! II! II! II! II! II! II! II! II! II! II!
II! The chemical most commonly used to raise pH is: - Correct Answers Sodium carbonate
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! An example of a chemical used to stabilize chlorine is: - Correct Answers Cyanuric acid
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The chemical reagent recommended by the health department to test chlorine residual in swimming
II! II! II! II! II! II! II! II! II! II! II! II! II!
II! pools is: - Correct Answers D.P.D.II! II! II! II! II! II! II! II! II!
II! The chemical reagent used most often to test pH in swimming pools is: - Correct Answers Phenol red
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Considering all factors, which of the following would be the BEST range for pH in a swimming pool: -
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Correct Answers 7.2-7.8 II! II! II! II! II!
II! The minimum turnover rate to obtain 100% clarity in a pool is: - Correct Answers Once in eight hours
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! There is a noticeable odor of chlorine around your pool and bathers are complaining of eye irritation.
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Which of the following is most likely to solve the problem: - Correct Answers Break point chlorination
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! As pH increases, chlorine effectiveness: - Correct Answers Decreases
II! II! II! II! II! II! II! II! II! II! II! II!
II! In a high-rate sand filter system, the tanks are backwashed: - Correct Answers All at once
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! The baffle in the filter tank is there to: - Correct Answers Disperse water evenly over the surface of the
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! filter media II!
