CPO CERTIFICATION PRACTICE TEST
2025 QUESTIONS WITH COMPLETE
SOLUTIONS
, 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:
A. clear the pool of users and boost the free chlorine to 17 ppm
B. clear the pool and raise the free chlorine to 2 ppm
C. allow swimmers to remain in the pool, but raise the free chlorine to 10 ppm.
D. none of the above - ANSWERB. clear the pool and raise the free chlorine to 2 ppm
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?
A. 6 gallons
B. 3.5 gallons
C. 9 gallons
D. 35 gallons - ANSWERB. 3.5 gallons
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:
A. too much free chlorine in the water
B. too few swimmers in the pool
C. high levels of chloramines in the pool
D. high calcium levels in the water - ANSWERC. high levels of chloramines in the pool
To determine the level of chloramines in the water, you should do which of the
following?
A. test for free chlorine and pH, then divide the pH number by the free chlorine number
B. test for total chlorine and free chlorine, then subtract the free chlorine number from
the total chlorine number
C. test for total chlorine and combined chlorine, then subtract the combined chlorine
number from the free chlorine number
2025 QUESTIONS WITH COMPLETE
SOLUTIONS
, 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:
A. clear the pool of users and boost the free chlorine to 17 ppm
B. clear the pool and raise the free chlorine to 2 ppm
C. allow swimmers to remain in the pool, but raise the free chlorine to 10 ppm.
D. none of the above - ANSWERB. clear the pool and raise the free chlorine to 2 ppm
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?
A. 6 gallons
B. 3.5 gallons
C. 9 gallons
D. 35 gallons - ANSWERB. 3.5 gallons
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:
A. too much free chlorine in the water
B. too few swimmers in the pool
C. high levels of chloramines in the pool
D. high calcium levels in the water - ANSWERC. high levels of chloramines in the pool
To determine the level of chloramines in the water, you should do which of the
following?
A. test for free chlorine and pH, then divide the pH number by the free chlorine number
B. test for total chlorine and free chlorine, then subtract the free chlorine number from
the total chlorine number
C. test for total chlorine and combined chlorine, then subtract the combined chlorine
number from the free chlorine number
