Certified Pool Operator {Pool and Hot tub} Practice Test
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
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1. You operate a 45,000 gallon indoor pool, and upon doing your hourly chemical tests you
observe the following readings:
Total available chlorine is 2.2
Free available chlorine is 1.4
pH is 7.6
What is the level of chloramines in this pool?
A. 3.6
B. .8
C. -.8
D. 2.8 - Correct Answer:
2. To remove the chloramines in the pool in question #5, how much of the following
compounds would be needed?
A). Using Chlorine gas:
A. 4 lbs.
B. 24.13 lbs.
C. 5.666 lbs.
D. 2.413 lbs.
,B). Using Sodium Hypochlorite:
A. 12 gallons
B. 2.48 gallons
C. 4.05 gallons
D. 3.11 gallons
C). Using Calcium Hypochlorite:
A. 3.71 lbs.
B. 2.36 lbs.
C. 37.1 lbs.
D. 5 lbs. - Correct Answer: A) A
B) B
C) A
3. You are the operator of a 330,000 gallon outdoor pool. Your local health department requires
you to perform a water balance calculation once monthly. Upon performing the water tests
necessary to perform this calculation, you observe the following readings in your pool:
Total alkalinity is 50 ppm
pH is 7.2
Calcium Hardness is 150 ppm
Temperature is 76F
Total Dissolved Solids is 500 ppm
Using these readings, what is the Saturation Index for this pool?
A. +0.8
,B. +0.3
C. -0.8
D. -8.0 - Correct Answer: C. -0.8
4. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which
chemical would be most appropriate?
A. Sodium Hypochlorite
B. Sodium Bicarbonate
C. Sodium Carbonate
D. Sodium Chloride - Correct Answer: B. Sodium Bicarbonate
5. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical
would be most appropriate?
A. Sodium Carbonate
B. Sodium Chloride
C. Chlorine Gas
D. Sodium Thiosulfate - Correct Answer: A. Sodium Carbonate
6. You are the CPO for a 28,000 gallon hotel pool. You perform a water balance chemical test,
and to your surprise, the Calcium Hardness is only 100 ppm. How much calcium chloride (77%)
would be required to increase this to 400 ppm?
A. 10 lbs.
B. 1,000 lbs.
C. 100.8 lbs.
D. 1.0 lbs. - Correct Answer: C. 100.8 lbs.
, 7. You are the CPO for a 100 foot long, 50 foot wide country club pool. The average depth of this
pool is 7 feet. You return to the pool on Monday morning, after a rare weekend off, and find
that the auto-fill feature has failed to work, and the pool water level is four inches too low. How
many gallons of water must be added to return the water to the proper level?
A. 120,480 gallons
B. 3.123 gallons
C. 12,495 gallons
D. 15,000 gallons - Correct Answer: C. 12,495 gallons
8. You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per
day. According to the CPO Handbook, how often should the water in this spa be changed?
A. 20 days
B. 10 days
C. 100 days
D. 1 day - Correct Answer: B. 10 days
10. You are the CPO for a large municipal swimming pool. This pool has a volume of 560,000
gallons of water, and has an average daily bather load of 1300 people. The pool is operated
using high rate pressure sand filters. How often should you backwash the filters?
A. Once per week
B. Every 168 hours
C. When the influent and effluent gauges are 10 to 20 psi apart
D. Whenever the pool manager tells you to - Correct Answer: C. When the influent and
effluent gauges are 10 to 20 psi apart
11. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because:
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. You operate a 45,000 gallon indoor pool, and upon doing your hourly chemical tests you
observe the following readings:
Total available chlorine is 2.2
Free available chlorine is 1.4
pH is 7.6
What is the level of chloramines in this pool?
A. 3.6
B. .8
C. -.8
D. 2.8 - Correct Answer:
2. To remove the chloramines in the pool in question #5, how much of the following
compounds would be needed?
A). Using Chlorine gas:
A. 4 lbs.
B. 24.13 lbs.
C. 5.666 lbs.
D. 2.413 lbs.
,B). Using Sodium Hypochlorite:
A. 12 gallons
B. 2.48 gallons
C. 4.05 gallons
D. 3.11 gallons
C). Using Calcium Hypochlorite:
A. 3.71 lbs.
B. 2.36 lbs.
C. 37.1 lbs.
D. 5 lbs. - Correct Answer: A) A
B) B
C) A
3. You are the operator of a 330,000 gallon outdoor pool. Your local health department requires
you to perform a water balance calculation once monthly. Upon performing the water tests
necessary to perform this calculation, you observe the following readings in your pool:
Total alkalinity is 50 ppm
pH is 7.2
Calcium Hardness is 150 ppm
Temperature is 76F
Total Dissolved Solids is 500 ppm
Using these readings, what is the Saturation Index for this pool?
A. +0.8
,B. +0.3
C. -0.8
D. -8.0 - Correct Answer: C. -0.8
4. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which
chemical would be most appropriate?
A. Sodium Hypochlorite
B. Sodium Bicarbonate
C. Sodium Carbonate
D. Sodium Chloride - Correct Answer: B. Sodium Bicarbonate
5. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical
would be most appropriate?
A. Sodium Carbonate
B. Sodium Chloride
C. Chlorine Gas
D. Sodium Thiosulfate - Correct Answer: A. Sodium Carbonate
6. You are the CPO for a 28,000 gallon hotel pool. You perform a water balance chemical test,
and to your surprise, the Calcium Hardness is only 100 ppm. How much calcium chloride (77%)
would be required to increase this to 400 ppm?
A. 10 lbs.
B. 1,000 lbs.
C. 100.8 lbs.
D. 1.0 lbs. - Correct Answer: C. 100.8 lbs.
, 7. You are the CPO for a 100 foot long, 50 foot wide country club pool. The average depth of this
pool is 7 feet. You return to the pool on Monday morning, after a rare weekend off, and find
that the auto-fill feature has failed to work, and the pool water level is four inches too low. How
many gallons of water must be added to return the water to the proper level?
A. 120,480 gallons
B. 3.123 gallons
C. 12,495 gallons
D. 15,000 gallons - Correct Answer: C. 12,495 gallons
8. You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per
day. According to the CPO Handbook, how often should the water in this spa be changed?
A. 20 days
B. 10 days
C. 100 days
D. 1 day - Correct Answer: B. 10 days
10. You are the CPO for a large municipal swimming pool. This pool has a volume of 560,000
gallons of water, and has an average daily bather load of 1300 people. The pool is operated
using high rate pressure sand filters. How often should you backwash the filters?
A. Once per week
B. Every 168 hours
C. When the influent and effluent gauges are 10 to 20 psi apart
D. Whenever the pool manager tells you to - Correct Answer: C. When the influent and
effluent gauges are 10 to 20 psi apart
11. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because:
