🏊 Ace the Pool Operator Exam: 125+ Must-Know Questions
for Guaranteed Success
✅ Master your test with these rapid-fire, high-retention
questions Perfect for last-minute review or deep study.
1. What is the whole range of chlorine in a pool?
1 to 5 ppm
2. What is the ideal range of chlorine in a pool?
2 to 4 ppm
3. What is the whole range of chlorine in a spa?
2 to 10 ppm
4. What is the ideal range of chlorine in a spa?
3 to 5 ppm
5. What are the four types of solid chlorine?
Calcium hypochlorite, lithium hypochlorite, trichlor, dichlor
6. What is liquid chlorine also known as?
Sodium hypochlorite (NaOCl)
7. How active is gas chlorine?
100%
, 8. What is the active killing form of chlorine in water?
Hypochlorous acid (HOCl)
9. What does HOCl dissociate into?
H+ (hydrogen ion) + OCl- (hypochlorite ion)
10. What is the most common granular chlorine and its pH range?
Calcium hypochlorite (8.5 - 11, used to super chlorinate water)
11. What is a less common form of chlorine due to low strength and its pH?
Lithium hypochlorite (10.8)
12. What type of chlorine is used in erosion feeders and what is its pH effect?
Trichlor (2.8 - 3.5, lowers alkalinity and pH over time)
13. What chlorine is commonly used in vinyl-lined pools and its pH?
Dichlor (6.7)
14. What is the most common type of chlorine and its pH?
Sodium hypochlorite (NaOCl - 13)
15. What chlorine type needs special training, and what are its pH and effect
on pH?
Gas chlorine, 0, lowers pH
16. At what pH is chlorine most effective?
7.5
17. What is the active disinfectant in the water?
Free chlorine (FC)
for Guaranteed Success
✅ Master your test with these rapid-fire, high-retention
questions Perfect for last-minute review or deep study.
1. What is the whole range of chlorine in a pool?
1 to 5 ppm
2. What is the ideal range of chlorine in a pool?
2 to 4 ppm
3. What is the whole range of chlorine in a spa?
2 to 10 ppm
4. What is the ideal range of chlorine in a spa?
3 to 5 ppm
5. What are the four types of solid chlorine?
Calcium hypochlorite, lithium hypochlorite, trichlor, dichlor
6. What is liquid chlorine also known as?
Sodium hypochlorite (NaOCl)
7. How active is gas chlorine?
100%
, 8. What is the active killing form of chlorine in water?
Hypochlorous acid (HOCl)
9. What does HOCl dissociate into?
H+ (hydrogen ion) + OCl- (hypochlorite ion)
10. What is the most common granular chlorine and its pH range?
Calcium hypochlorite (8.5 - 11, used to super chlorinate water)
11. What is a less common form of chlorine due to low strength and its pH?
Lithium hypochlorite (10.8)
12. What type of chlorine is used in erosion feeders and what is its pH effect?
Trichlor (2.8 - 3.5, lowers alkalinity and pH over time)
13. What chlorine is commonly used in vinyl-lined pools and its pH?
Dichlor (6.7)
14. What is the most common type of chlorine and its pH?
Sodium hypochlorite (NaOCl - 13)
15. What chlorine type needs special training, and what are its pH and effect
on pH?
Gas chlorine, 0, lowers pH
16. At what pH is chlorine most effective?
7.5
17. What is the active disinfectant in the water?
Free chlorine (FC)
