CO Pool And Spa Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the minimum depth for a swimming pool main drain to
prevent entrapment?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: Proper depth reduces the risk of suction entrapment and
complies with safety standards.
2. Which type of electrical protection is required for pool pumps?
A. Standard breaker
B. GFCI
C. Surge protector
D. AFCI
Rationale: Ground-fault circuit interrupters protect against electrocution
near water.
,3. The main purpose of a pool skimmer is to:
A. Heat the water
B. Add chemicals
C. Remove floating debris
D. Circulate water
Rationale: Skimmers collect leaves, insects, and debris from the water
surface.
4. Which chemical raises pH in pool water?
A. Muriatic acid
B. Sodium carbonate
C. Sodium bisulfate
D. Calcium chloride
Rationale: Sodium carbonate (soda ash) increases pH levels for water
balance.
5. The recommended pH range for pools is:
A. 5.5–6.5
B. 6.8–7.0
C. 7.2–7.8
D. 8.0–8.5
Rationale: Proper pH maintains sanitizer effectiveness and comfort for
bathers.
6. Pool water should circulate through the filter at least:
A. 30 minutes/day
B. 8–12 hours/day
C. 1–2 hours/week
D. 24 hours continuously
, Rationale: Adequate turnover ensures proper filtration and chemical
distribution.
7. The main function of a pool filter is to:
A. Heat water
B. Remove suspended particles
C. Adjust pH
D. Circulate chemicals
Rationale: Filters trap dirt and debris to maintain water clarity.
8. Which type of pool pump is most energy efficient?
A. Single-speed pump
B. Variable-speed pump
C. Standard jet pump
D. Booster pump only
Rationale: Variable-speed pumps reduce energy consumption while
maintaining flow.
9. Which of the following sanitizers is effective in high-temperature
pools?
A. Chlorine only
B. Bromine
C. Biguanide only
D. Ozone only
Rationale: Bromine remains stable and effective at elevated water
temperatures.
10. The recommended total alkalinity for pools is:
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the minimum depth for a swimming pool main drain to
prevent entrapment?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: Proper depth reduces the risk of suction entrapment and
complies with safety standards.
2. Which type of electrical protection is required for pool pumps?
A. Standard breaker
B. GFCI
C. Surge protector
D. AFCI
Rationale: Ground-fault circuit interrupters protect against electrocution
near water.
,3. The main purpose of a pool skimmer is to:
A. Heat the water
B. Add chemicals
C. Remove floating debris
D. Circulate water
Rationale: Skimmers collect leaves, insects, and debris from the water
surface.
4. Which chemical raises pH in pool water?
A. Muriatic acid
B. Sodium carbonate
C. Sodium bisulfate
D. Calcium chloride
Rationale: Sodium carbonate (soda ash) increases pH levels for water
balance.
5. The recommended pH range for pools is:
A. 5.5–6.5
B. 6.8–7.0
C. 7.2–7.8
D. 8.0–8.5
Rationale: Proper pH maintains sanitizer effectiveness and comfort for
bathers.
6. Pool water should circulate through the filter at least:
A. 30 minutes/day
B. 8–12 hours/day
C. 1–2 hours/week
D. 24 hours continuously
, Rationale: Adequate turnover ensures proper filtration and chemical
distribution.
7. The main function of a pool filter is to:
A. Heat water
B. Remove suspended particles
C. Adjust pH
D. Circulate chemicals
Rationale: Filters trap dirt and debris to maintain water clarity.
8. Which type of pool pump is most energy efficient?
A. Single-speed pump
B. Variable-speed pump
C. Standard jet pump
D. Booster pump only
Rationale: Variable-speed pumps reduce energy consumption while
maintaining flow.
9. Which of the following sanitizers is effective in high-temperature
pools?
A. Chlorine only
B. Bromine
C. Biguanide only
D. Ozone only
Rationale: Bromine remains stable and effective at elevated water
temperatures.
10. The recommended total alkalinity for pools is:
