CERTIFIED POOL OPERATOR CPO HANDBOOK COMPREHENSIVE EXAM SCRIPT COMPLETE QUESTIONS VERIFIED SOLUTIONS

CERTIFIED POOL OPERATOR CPO HANDBOOK COMPREHENSIVE EXAM SCRIPT
COMPLETE QUESTIONS VERIFIED SOLUTIONS
Certified POOL Operator CPO Handbook
Certification Review SET 2026/2027 Questions and
Answers Verified Solutions Latest Update

Question:
2. Assuming that your local health department requires you to raise the free chlorine to 5 ppm, how
much sodium hypochlorite would be needed to raise the free chlorine in the pool in question #1 to
that level?

Answer:
3.5 gallons



Question:
3. You are the CPO for an indoor health club pool. The facility manager informs you that he is
receiving complaints about a strong chlorine odor in the pool area, and several members have
complained of eye irritation. The most likely cause of these complaints is:

Answer:
high levels of chloramines in the pool



Question:
4. To determine the level of chloramines in the water, you should do which of the following?

Answer:
test for total chlorine and free chlorine, then subtract the free chlorine number from the total chlorine



Question:
5. 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 and pH is 7.6
What is the level of chloramines in this pool?

Answer:

,0.8



Question:
7. 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 76 degrees F Total Dissolved Solids is 500
ppm Using these readings, what is the Saturation Index for this pool?

Answer:
-0.8



Question:
8. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which
chemical would be most appropriate?

Answer:
Sodium Bicarbonate



Question:
9. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be
most appropriate?

Answer:
Sodium Carbonate



Question:
10. 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?"

Answer:
100.8 lbs.

, Question:
11. 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?

Answer:
12,495 gallons



Question:
12. 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?

Answer:
10 days



Question:
"13. 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?"

Answer:
When the influent and effluent gauges are 10 to 20 psi apart



Question:
14. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because:

Answer:
OTO only tests for Total Chlorine



Question:
15. Safety and rescue equipment should always be: