Certified Pool Operator Handbook Practice Test – 2025
Update Top Verified Solution
1. You operate a 120,000-gallon pool, and upon performing your hourly chemical tests you observe
the following readings: Total Available Chlorine reading is 1.6 free available chlorine reading is 1.5
pH is 7.4 your supervising lifeguard has just informed you that you have had a fecal incident occur; a
solid stool has been discharged into the pool. According to the Centers for Disease Control, as the
CPO, you should do the following: - ANS ✔ - clear the pool and raise the free chlorine to 2 ppm
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? - ANS ✔ - 3.5 gallons
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: - ANS ✔ - high levels of chloramines in the
pool
4. To determine the level of chloramines in the water, you should do which of the following? - ANS ✔
- test for total chlorine and free chlorine, then subtract the free chlorine number from the total
chlorine
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? - ANS ✔ - 0.8
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? - ANS ✔ - -0.8
8. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which
chemical would be most appropriate? - ANS ✔ - Sodium Bicarbonate
, Certified Pool Operator Handbook Practice Test – 2025
Update Top Verified Solution
9. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be
most appropriate? - ANS ✔ - Sodium Carbonate
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?" - ANS ✔ - 100.8 lbs.
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? - ANS ✔ - 12,495 gallons
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? - ANS ✔ - 10
days
"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?" - ANS ✔ - When the influent and
effluent gauges are 10 to 20 psi apart
14. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because: - ANS
✔ - OTO only tests for Total Chlorine
15. Safety and rescue equipment should always be: - ANS ✔ - Kept easily accessible around the pool
16. Which type of filter system will remove the smallest micron particles? - ANS ✔ - diatomaceous
earth
17. If the pump fails to prime, which of the following does not have to be checked? - ANS ✔ - filter
system pressure is too high
Update Top Verified Solution
1. You operate a 120,000-gallon pool, and upon performing your hourly chemical tests you observe
the following readings: Total Available Chlorine reading is 1.6 free available chlorine reading is 1.5
pH is 7.4 your supervising lifeguard has just informed you that you have had a fecal incident occur; a
solid stool has been discharged into the pool. According to the Centers for Disease Control, as the
CPO, you should do the following: - ANS ✔ - clear the pool and raise the free chlorine to 2 ppm
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? - ANS ✔ - 3.5 gallons
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: - ANS ✔ - high levels of chloramines in the
pool
4. To determine the level of chloramines in the water, you should do which of the following? - ANS ✔
- test for total chlorine and free chlorine, then subtract the free chlorine number from the total
chlorine
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? - ANS ✔ - 0.8
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? - ANS ✔ - -0.8
8. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which
chemical would be most appropriate? - ANS ✔ - Sodium Bicarbonate
, Certified Pool Operator Handbook Practice Test – 2025
Update Top Verified Solution
9. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be
most appropriate? - ANS ✔ - Sodium Carbonate
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?" - ANS ✔ - 100.8 lbs.
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? - ANS ✔ - 12,495 gallons
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? - ANS ✔ - 10
days
"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?" - ANS ✔ - When the influent and
effluent gauges are 10 to 20 psi apart
14. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because: - ANS
✔ - OTO only tests for Total Chlorine
15. Safety and rescue equipment should always be: - ANS ✔ - Kept easily accessible around the pool
16. Which type of filter system will remove the smallest micron particles? - ANS ✔ - diatomaceous
earth
17. If the pump fails to prime, which of the following does not have to be checked? - ANS ✔ - filter
system pressure is too high
