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Certified Pool Operator Handbook Practice Test – 2026, Exams of Operating Systems

Johns Hopkins University (JHU)Operating Systems

Certified Pool Operator Handbook Practice Test – 2026

Typology: Exams

2025/2026

Available from 01/15/2026

Prof.-Peter-Agre.
Prof.-Peter-Agre. 🇺🇸

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Certified Pool Operator Handbook
Practice Test – 2026
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: - ANSWER-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? - 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
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Certified Pool Operator Handbook

Practice Test – 2026

  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: - ANSWER-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? - 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.
  6. 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.
  7. 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
  8. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be most appropriate? - ANSWER-Sodium Carbonate 1 0. 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. 1 1. 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 too low. How many gallons of water must be added to return the water to the proper level? - ANSWER-12,495 gallons

  1. You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per day. According to the CPO Handbook, how often should the water in this spa be changed? - ANSWER-10 days "13. You are the CPO for a large municipal swimming pool. 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?" - ANSWER-When the influent and effluent gauges are 10 to 20 psi apart
  2. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because: - ANSWER-OTO only tests for Total Chlorine
  3. Safety and rescue equipment should always be: - ANSWER-Kept easily accessible around the pool
  4. Which type of filter system will remove the smallest micron particles? - ANSWER- diatomaceous earth
  5. If the pump fails to prime, which of the following does not have to be checked? - ANSWER-filter system pressure is too high
  6. Oxidation Reduction Potential testing (ORP) is measured in? - ANSWER-mV
  7. High calcium hardness can result in what condition? - ANSWER-cloudy water
  8. Head first entry dives are: - ANSWER-only allowed in areas of the pool that are not marked as 'NO DIVING'
  9. Opening and closing checklists: - ANSWER-all of the above
  10. You can become sick from ingesting water infected with Legionella bacteria - ANSWER-false
  11. Channeling of filters occurs when: - ANSWER-the FMR is exceeded, and water cuts a channel through the media
  12. The only physical factor that affects water balance is: - ANSWER-temperature

"33. You are the aquatics manager at a very busy local gym that is open 24 hours per day, 7 days per week. This gym has a 1,850 gallon spa. This spa is in almost constant use with about 100 bathers per day using the spa (on - ANSWER- average). You begin to get complaints from the bathers that their eyes are burning and their skin itches after soaking." - ANSWER-6 days

  1. When performing a color matching water test, when using the comparator, you should: - ANSWER-hold the sample up to the horizon opposite the sun or a daylight illuminator
  2. Which of the following would not be considered an acceptable ADA access method?
  • ANSWER-corner steps with a vertical rise of less than 11 inches
  1. According to the Certified Pool - Spa Operator Handbook, which of the following should result in the immediate closure of a pool or spa? - ANSWER-ph level is 8.
  2. One cubic foot of water contains gallons. - ANSWER-7.
  3. One cubic foot of water weighs pounds. - ANSWER-62.
  4. One gallon of water weighs pounds. - ANSWER-8.
  5. What effect does gas chlorine have on pH in water? - ANSWER-lowers
  6. What is the ideal range for total alkalinity? - ANSWER-80 to 120 ppm
  7. The amount of unfiltered water is reduced to after four turnovers. - ANSWER-2%
  8. What is considered the necessary backwash rate to achieve proper agitation when backwashing sand filters? - ANSWER-15 gpm/sf
  9. According to the Certified Pool - Spa Operator Handbook, to provide proper building protection and comfort to users the humidity levels for indoor pools and spas should be maintained between - ANSWER-40 to 60%
  10. What is the process of replacing used diatomaceous earth powder with fresh powder called? - ANSWER-pre.coating
  11. According to the Certified Pool - Spa Operator Handbook, the acceptable pH reading is: - ANSWER-7 2 to 7 8
  12. When determining the degree of saturation and pool water the constant (12.1) includes a factor for Total Dissolved Solids (TDS), assuming a value of less than 1, ppm TDS. When the TDS is found to be higher (1,000-2,000 ppm) a value of should be used for the constant." - ANSWER-12.
  1. Water with a pH of less than 7.0 is said to be: - ANSWER-acidic
  2. According to the Certified Pool - Spa Operator Handbook, the ideal level for total water alkalinity is ppm - ANSWER- 80 - 120
  3. Spas and hot tubs require a higher level of chlorine than in swimming pools. The free available chlorine concentration should be maintained at ppm with hourly checks during heavy use. - ANSWER-3 0-5.
  4. According to the Certified Pool - Spa Operator Handbook, filtration and recirculation pumps should operate _______________ hours continuously for public spas and therapy pools. - ANSWER- 24
  5. The addition of Trichlor Tables to a swimming pool has what effect of the pH level? - ANSWER-lowers pH
  6. Heat loss to the ground from a pool through its sides, bottom, pipes and filters is called. - ANSWER-conduction
  7. Water clarity is measured in units of. - ANSWER-turbidity
  8. A valve has a vertical disc or wedge attached to a long threaded stem that when rotated either seals or unblocks the flow of water. - ANSWER-gate
  9. According to the Certified Pool - Spa Operator Handbook, cyanuric acid levels shall not exceed local health codes. In many cases the limit is ppm. - ANSWER-100 ppm
  10. What is the name of the area of a centrifugal pump that converts water energy from velocity to pressure? - ANSWER-volute
  11. How much sodium bicarbonate should be added to a 2,000 gallon spa to increase the total alkalinity by 14ppm? - ANSWER-6.27 oz
  12. Pools of similar surface area located in the same geographical region, but with differing water depths will have the same. - ANSWER-surface heat loss
  13. According to The Certified Pool - Spa Operator Handbook, pressure head is calculated by multiplying the psi by. - ANSWER-2.
  14. 1 pound per square inch (psi) is the pressure created by a column of water feet high. - ANSWER-2.
  15. In a pool containing 35,000 gallons which is 15 x 40 ft with the temp of 65 degrees F, BTU's would be required to raise the water temperature to 75 degrees F if the air temp is 65 degrees F. - ANSWER-2,915,
  1. To control scaling, pool water that exceeds ppm hardness should be diluted or replaced with water of substantially lower hardness. - ANSWER- 800 - 1000
  2. In determining cost for heating, it is best to size the heater to the number of gallons of water in the spa and in the spa and to the desired temperature. BTUs will heat 1 gallon of water 1 degree F. - ANSWER-8.
  3. A _________ is used to radiate the high temperature of the water and cool it enough to allow the remainder of the circulation piping to the PVC. - ANSWER-Heat sink