Pool and Spa Operator Final Exam Questions and Answer
| Latest 2025/2026 Edition | Certified Pool & Spa Operator
(CPO) Certification | 100% Correct
1. The percentage of hypoclorous acid formation is most influenced by
Answer pH
2. Pool painting is usually done
Answer Before opening in the spring
3. When a pool is chlorinated with gas chlorine, the operator must also use
Answer Soda Ash
4. The term "chlorine demand" refers to
Answer The amount of chlorine which will react with substances in the pool
5. Re-circulation pumps used in swimming pools are the type called
Answer Centrifugal pumps
6. Reversing the flow of water through the filters is called
Answer Backwash
7. "Slurry feed" or "body feed" refers to
Answer Diatomite added during a filter run
, 8. The term pH is determined by the concentration of
Answer Hydrogen ions
9. Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to
Answer Rise
10.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
Answer Break-point
11. "Residual chlorine" refers to
Answer The amount left in the water after oxidation of organic material
12. Which of the following is NOT considered a swimming pool disinfectant
Answer Chlo- rinated hydrocarbons
13.When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant
properties are the greatest is
Answer Hypochlorous acid
14. The chemical most commonly used to raise pH is
Answer Sodium carbonate
15. An example of a chemical used to stabilize chlorine is
Answer Cyanuric acid
16. The chemical reagent recommended by the health department to test chlo- rine residual in swimming
| Latest 2025/2026 Edition | Certified Pool & Spa Operator
(CPO) Certification | 100% Correct
1. The percentage of hypoclorous acid formation is most influenced by
Answer pH
2. Pool painting is usually done
Answer Before opening in the spring
3. When a pool is chlorinated with gas chlorine, the operator must also use
Answer Soda Ash
4. The term "chlorine demand" refers to
Answer The amount of chlorine which will react with substances in the pool
5. Re-circulation pumps used in swimming pools are the type called
Answer Centrifugal pumps
6. Reversing the flow of water through the filters is called
Answer Backwash
7. "Slurry feed" or "body feed" refers to
Answer Diatomite added during a filter run
, 8. The term pH is determined by the concentration of
Answer Hydrogen ions
9. Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to
Answer Rise
10.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
Answer Break-point
11. "Residual chlorine" refers to
Answer The amount left in the water after oxidation of organic material
12. Which of the following is NOT considered a swimming pool disinfectant
Answer Chlo- rinated hydrocarbons
13.When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant
properties are the greatest is
Answer Hypochlorous acid
14. The chemical most commonly used to raise pH is
Answer Sodium carbonate
15. An example of a chemical used to stabilize chlorine is
Answer Cyanuric acid
16. The chemical reagent recommended by the health department to test chlo- rine residual in swimming
