Certified Pool Operator Handbook | Practice Test & Answers | Exam Prep
1. You operate a 120,000-gallon pool, and upon clear the pool and raise the free chlorine to 2 ppm
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:
2. Assuming that your local health department requires you 3.5 gallons
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?
3. You are the CPO for an indoor health club pool. The high levels of chloramines in the pool
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:
4. To determine the level of chloramines in the water, you test for total chlorine and free chlorine, then subtract the free chlorine number from
should do which of the following? the total chlorine
5. You operate a 45,000 gallon indoor pool, and upon 0.8
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?
7. You are the operator of a 330,000 gallon outdoor pool. -0.8
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?
8. To adjust the tested Total Alkalinity in the pool in Sodium Bicarbonate
question #7 to an acceptable level, which chemical would
be most appropriate?
9. To adjust the tested pH in the pool in question #7 to an Sodium Carbonate
acceptable level, which chemical would be most
appropriate?
10. You are the CPO for a 28,000 gallon hotel pool. You 100.8 lbs.
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?"
11. You are the CPO for a 100 foot long, 50 foot wide 12,495 gallons
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?
12. You are the operator of a 3,000 gallon health club spa, 10 days
which has an average of 100 users per day. According to
the CPO Handbook, how often should the water in this spa
be changed?
Grade A+ | Updated
, Certified Pool Operator Handbook | Practice Test & Answers | Exam Prep
"13. You are the CPO for a large municipal swimming pool. When the influent and effluent gauges are 10 to 20 psi apart
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?"
14. In testing for Chlorine/Bromine in a commercial pool, OTO only tests for Total Chlorine
DPD is preferred over OTO because:
15. Safety and rescue equipment should always be: Kept easily accessible around the pool
16. Which type of filter system will remove the smallest diatomaceous earth
micron particles?
17. If the pump fails to prime, which of the following does filter system pressure is too high
not have to be checked?
18. Oxidation Reduction Potential testing (ORP) is mV
measured in?
19. High calcium hardness can result in what condition? cloudy water
20. Head first entry dives are: only allowed in areas of the pool that are not marked as 'NO DIVING'
21. Opening and closing checklists: all of the above
22. You can become sick from ingesting water infected false
with Legionella bacteria
23. Channeling of filters occurs when: the FMR is exceeded, and water cuts a channel through the media
24. The only physical factor that affects water balance is: temperature
25. To be classified as a disinfectant, a compound must kill leave a measurable residual in the water
or inactivate 99.9% of contaminants as well as:
26. Pools using chlorine gas as a disinfectant produce caustic soda or soda ash
hydrochloric acid, which can be neutralized with:
27. When balancing swimming pool water, the following total alkalinity
should be adjusted first:
Grade A+ | Updated
1. You operate a 120,000-gallon pool, and upon clear the pool and raise the free chlorine to 2 ppm
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:
2. Assuming that your local health department requires you 3.5 gallons
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?
3. You are the CPO for an indoor health club pool. The high levels of chloramines in the pool
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:
4. To determine the level of chloramines in the water, you test for total chlorine and free chlorine, then subtract the free chlorine number from
should do which of the following? the total chlorine
5. You operate a 45,000 gallon indoor pool, and upon 0.8
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?
7. You are the operator of a 330,000 gallon outdoor pool. -0.8
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?
8. To adjust the tested Total Alkalinity in the pool in Sodium Bicarbonate
question #7 to an acceptable level, which chemical would
be most appropriate?
9. To adjust the tested pH in the pool in question #7 to an Sodium Carbonate
acceptable level, which chemical would be most
appropriate?
10. You are the CPO for a 28,000 gallon hotel pool. You 100.8 lbs.
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?"
11. You are the CPO for a 100 foot long, 50 foot wide 12,495 gallons
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?
12. You are the operator of a 3,000 gallon health club spa, 10 days
which has an average of 100 users per day. According to
the CPO Handbook, how often should the water in this spa
be changed?
Grade A+ | Updated
, Certified Pool Operator Handbook | Practice Test & Answers | Exam Prep
"13. You are the CPO for a large municipal swimming pool. When the influent and effluent gauges are 10 to 20 psi apart
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?"
14. In testing for Chlorine/Bromine in a commercial pool, OTO only tests for Total Chlorine
DPD is preferred over OTO because:
15. Safety and rescue equipment should always be: Kept easily accessible around the pool
16. Which type of filter system will remove the smallest diatomaceous earth
micron particles?
17. If the pump fails to prime, which of the following does filter system pressure is too high
not have to be checked?
18. Oxidation Reduction Potential testing (ORP) is mV
measured in?
19. High calcium hardness can result in what condition? cloudy water
20. Head first entry dives are: only allowed in areas of the pool that are not marked as 'NO DIVING'
21. Opening and closing checklists: all of the above
22. You can become sick from ingesting water infected false
with Legionella bacteria
23. Channeling of filters occurs when: the FMR is exceeded, and water cuts a channel through the media
24. The only physical factor that affects water balance is: temperature
25. To be classified as a disinfectant, a compound must kill leave a measurable residual in the water
or inactivate 99.9% of contaminants as well as:
26. Pools using chlorine gas as a disinfectant produce caustic soda or soda ash
hydrochloric acid, which can be neutralized with:
27. When balancing swimming pool water, the following total alkalinity
should be adjusted first:
Grade A+ | Updated
