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 Cen-
ters for Disease Control, as the CPO, you should do the following:
ANSWER
clear the pool and raise the free chlorine to 2 ppm
2. 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
3. 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
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 to-
tal chlorine
7. You are the operator of a 330,000 gallon outdoor pool. Your local health department re-
quires you to perform a water balance calculation once monthly. Upon performing the water
1
, 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
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
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 chlo-
ride (77%) would be required to increase this to 400 ppm?"
ANSWER
100.8 lbs.
2
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 Cen-
ters for Disease Control, as the CPO, you should do the following:
ANSWER
clear the pool and raise the free chlorine to 2 ppm
2. 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
3. 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
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 to-
tal chlorine
7. You are the operator of a 330,000 gallon outdoor pool. Your local health department re-
quires you to perform a water balance calculation once monthly. Upon performing the water
1
, 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
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
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 chlo-
ride (77%) would be required to increase this to 400 ppm?"
ANSWER
100.8 lbs.
2
