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CERTIFIED POOL OPERATOR HANDBOOK
PRACTICE TEST 2025 BRAND NEW ACTUAL
EXAM WITH ANSWERS.
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: -correct answer
-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? -correct answer -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: -correct answer -high levels of chloramines in the
pool
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4. To determine the level of chloramines in the water, you should
do which of the following? -correct answer -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? -correct answer -
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? -correct answer --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? -
correct answer -Sodium Bicarbonate
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9. To adjust the tested pH in the pool in question #7 to an
acceptable level, which chemical would be most appropriate? -
correct answer -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?" -correct answer -
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? -correct answer -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? -
correct answer -10 days
CERTIFIED POOL OPERATOR HANDBOOK
PRACTICE TEST 2025 BRAND NEW ACTUAL
EXAM WITH ANSWERS.
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: -correct answer
-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? -correct answer -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: -correct answer -high levels of chloramines in the
pool
, Page | 2
4. To determine the level of chloramines in the water, you should
do which of the following? -correct answer -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? -correct answer -
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? -correct answer --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? -
correct answer -Sodium Bicarbonate
, Page | 3
9. To adjust the tested pH in the pool in question #7 to an
acceptable level, which chemical would be most appropriate? -
correct answer -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?" -correct answer -
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? -correct answer -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? -
correct answer -10 days
