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Certified Pool Operator Handbook Practice Test Questions with solved solutions, Exams of Credit and Risk Management

Duke UniversityCredit and Risk Management

Certified Pool Operator Handbook Practice Test Questions with solved solutions

Typology: Exams

2025/2026

Available from 07/02/2026

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Certified Pool Operator Handbook Practice
Test - 2017
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
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Certified Pool Operator Handbook Practice

Test - 2017

  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
  1. 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
  2. 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
  3. 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.
  4. 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

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
  1. Which type of filter system will remove the smallest micron particles? - ANSWER - diatomaceous earth
  2. If the pump fails to prime, which of the following does not have to be checked? - ANSWER - filter system pressure is too high
  3. Oxidation Reduction Potential testing (ORP) is measured in?
  • ANSWER - mV
  1. High calcium hardness can result in what condition? - ANSWER - cloudy water
  2. Head first entry dives are: - ANSWER - only allowed in areas of the pool that are not marked as 'NO DIVING'
  3. Opening and closing checklists: - ANSWER - all of the above
  4. You can become sick from ingesting water infected with Legionella bacteria - ANSWER - false
  1. When performing a water test, sample water should be collected: - ANSWER - 18 inches below the surface, away from return line
  2. Swimming pool circulation systems should be adjusted to remove: - ANSWER - 75% from the surface
  3. Vacuuming of the pool bottom should be done: - ANSWER - after foreign matter has settled
  4. You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep. What is the total number of gallons of water in this pool? - ANSWER - 33,000 gallons
  5. b.)You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not

listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep.B). To achieve a 6 hour TOR in this pool, what flow rate would be needed? - ANSWER - 92 GPM

  1. c.) You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining the operational records, you find that the number of gallons in the pool is not listed in the records. You visit the pool and observe that it is a fairly rectangular concrete pool, with the following dimensions: length = 40 feet; width = 20 feet. The pool bottom slope is constant from the shallow end, which is 3 feet deep, to the deep end, which is 8 feet deep.C). You notice a clear greenish tint to the water. What could be the problem? - ANSWER - presence of copper "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, gallon spa. This spa is in almost constant use with about 100 bathers per day using the spa (on - ANSWER -
  1. What effect does gas chlorine have on pH in water? - ANSWER - lowers
  2. What is the ideal range for total alkalinity? - ANSWER - 80 to 120 ppm
  3. The amount of unfiltered water is reduced to after four turnovers. - ANSWER - 2%
  4. What is considered the necessary backwash rate to achieve proper agitation when backwashing sand filters? - ANSWER - 15 gpm/sf
  5. 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%
  6. What is the process of replacing used diatomaceous earth powder with fresh powder called? - ANSWER - pre.coating
  1. According to the Certified Pool - Spa Operator Handbook, the acceptable pH reading is: - ANSWER - 7 2 to 7 8
  2. 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 1,000 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.
  3. Water with a pH of less than 7.0 is said to be: - ANSWER - acidic
  4. According to the Certified Pool - Spa Operator Handbook, the ideal level for total water alkalinity is ppm - ANSWER - 80 - 120
  5. 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.
  1. What is the name of the area of a centrifugal pump that converts water energy from velocity to pressure? - ANSWER - volute
  2. How much sodium bicarbonate should be added to a 2, gallon spa to increase the total alkalinity by 14ppm? - ANSWER - 6.27 oz
  3. Pools of similar surface area located in the same geographical region, but with differing water depths will have the same. - ANSWER - surface heat loss
  4. According to The Certified Pool - Spa Operator Handbook, pressure head is calculated by multiplying the psi by. - ANSWER
  1. 1 pound per square inch (psi) is the pressure created by a column of water feet high. - ANSWER - 2.
  2. 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 raise FC in a 20,000 gallon pool by 2.0 ppm would require ounces of calcium hypochlorite. - ANSWER - 8
  2. Pool surface area accounts for percent of heat loss. - ANSWER - 50
  3. Green water that is transparent is usually due to. - ANSWER
  • copper ions in the water
  1. The most widely accepted flow rate for rapid rate sand filters in a public pool is per sq. ft. - ANSWER - 3 gpm
  2. The flow requirement of a rapid rate sand filter during backwashing is gpm per sq. ft. - ANSWER - 12 - 15
  3. The backwash ratio for high rate sand filters is ____ - ANSWER - 1:
  1. Calcium hypochlorite contains percent available chlorine by weight. - ANSWER - 65
  2. Bromine is similar in many respects to chlorine, however, bromine cannot be used for. - ANSWER - stabilization
  3. The solid chlorine compound which is used when a slow release of chlorine over time is desired is called: - ANSWER - trichlor
  4. Proper pH control of provides better chlorine efficiency. - ANSWER - 7.2-7.
  5. It is essential to maintain total alkalinity at ppm in plaster pools. - ANSWER - 80 - 120
  6. To control scaling, pool water that exceeds ppm hardness should be diluted or replaced with water of substantially lower hardness. - ANSWER - 800 - 1000
  1. 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.
  2. 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