CERTIFIED POOL OPERATOR 2
COMPREHENSIVE ASSESSMENT 2026 TESTED
QUESTIONS
◉ 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
◉ 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
◉ 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
◉ 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
, ◉ 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
◉ 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
◉ 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
◉ 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.
◉ 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
COMPREHENSIVE ASSESSMENT 2026 TESTED
QUESTIONS
◉ 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
◉ 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
◉ 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
◉ 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
, ◉ 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
◉ 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
◉ 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
◉ 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.
◉ 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
