Certified Pool Operator Handbook
Practice Test (2017 Exam) | CPO
Certification Study Guide|| GRADED A+||
LATEST UPDATE 2025/26
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: -CORRECTANSWER 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? -CORRECTANSWER 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: -CORRECTANSWER high levels of chloramines in the pool
, 4. To determine the level of chloramines in the water, you should do which of the
following? -CORRECTANSWER 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? -CORRECTANSWER
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? -CORRECTANSWER -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? -CORRECTANSWER Sodium Bicarbonate
9. To adjust the tested pH in the pool in question #7 to an acceptable level, which
chemical would be most appropriate? -CORRECTANSWER Sodium Carbonate
Practice Test (2017 Exam) | CPO
Certification Study Guide|| GRADED A+||
LATEST UPDATE 2025/26
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: -CORRECTANSWER 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? -CORRECTANSWER 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: -CORRECTANSWER high levels of chloramines in the pool
, 4. To determine the level of chloramines in the water, you should do which of the
following? -CORRECTANSWER 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? -CORRECTANSWER
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? -CORRECTANSWER -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? -CORRECTANSWER Sodium Bicarbonate
9. To adjust the tested pH in the pool in question #7 to an acceptable level, which
chemical would be most appropriate? -CORRECTANSWER Sodium Carbonate
