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1 Exam PrepCertified Pool Operator HandbookPractice Test1. You operate a 120,000 gallon pool, and upon performing your hourly chemical tests you observe thefollowing readings:Total Available Chlorine reading is 1.6Free available chlorine reading is1.5pH is7.4Your supervising lifeguard has just informed you that you have had a fecal incident occur; a solid stool has beendischarged into the pool. According to the Centers for Disease Control, as the CPO, you should do thefollowing:A. clear the pool of users and boost the free chlorine to 17 ppmB. clear the pool and raise the free chlorine to 2 ppmC. allow swimmers to remain in the pool, but raise the free chlorine to 10 ppm.D. none of the above2. Assuming that your local health department requires you to raise the free chlorine to 5 ppm, how muchsodium hypochlorite would be needed to raise the free chlorine in the pool in question #1 to that level?A. 6 gallonsB. 3.5 gallonsC. 9 gallonsD. 35 gallons3. You are the CPO for an indoor health club pool. The facility manager informs you that he is receivingcomplaints about a strong chlorine odor in the pool area, and several members have complained of eyeirritation. The most likely cause of these complaints is:A. too much free chlorine in the waterB. too few swimmers in the poolC. high levels of chloramines in the poolD. high calcium levels in the water4. 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 numberB. test for total chlorine and free chlorine, then subtract the free chlorine number from the total chlorinenumberC. test for total chlorine and combined chlorine, then subtract the combined chlorine number from thefree chlorine numberD. test for total alkalinity and pH, then multiply the total alkalinity number by the pH number1 Exam Prep – Certified Pool Operator Handbook1
5. You operate a 45,000 gallon indoor pool, and upon doing your hourly chemical tests you observe thefollowing readings:Total available chlorine is 2.2Free available chlorine is 1.4pH is 7.6What is the level of chloramines in this pool?A. 3.6B. .8C. -.8D. 2.86. To remove the chloramines in the pool in question #5, how much of the following compounds would beneeded?A). Using Chlorine gas:A. 4 lbs.B. 24.13 lbs.C. 5.666 lbs.D. 2.413 lbs.B). Using Sodium Hypochlorite:A. 12 gallonsB. 2.48 gallonsC. 4.05 gallonsD. 3.11 gallonsC). Using Calcium Hypochlorite:A. 3.71 lbs.B. 2.36 lbs.C. 37.1 lbs.D. 5 lbs.7. You are the operator of a 330,000 gallon outdoor pool. Your local health department requires you to performa water balance calculation once monthly. Upon performing the water tests necessary to perform thiscalculation, you observe the following readings in your pool:Total alkalinity ispH isCalcium Hardness isTemperature isTotal Dissolved Solids is50 ppm7.2150 ppm76 degrees F500 ppm1 Exam Prep – Certified Pool Operator Handbook2
Using these readings, what is the Saturation Index for this pool?A. 0.8B. 0.3C. -0.8D. -8.08. To adjust the tested Total Alkalinity in the pool in question #7 to an acceptable level, which chemical wouldbe most appropriate?A. Sodium HypochloriteB. Sodium BicarbonateC. Sodium CarbonateD. Sodium Chloride9. To adjust the tested pH in the pool in question #7 to an acceptable level, which chemical would be mostappropriate?A. Sodium CarbonateB. Sodium ChlorideC. Chlorine GasD. Sodium Thiosulfate10. You are the CPO for a 28,000 gallon hotel pool. You perform a water balance chemical test, and to yoursurprise, the Calcium Hardness is only 100 ppm. How much calcium chloride (77%) would be required toincrease this to 400 ppm?A. 10 lbs.B. 1,000 lbs.C. 100.8 lbs.D. 1.0 lbs.11. You are the CPO for a 100 foot long, 50 foot wide country club pool. The average depth of this pool is 7feet. You return to the pool on Monday morning, after a rare weekend off, and find that the auto-fill feature hasfailed to work, and the pool water level is four inches too low. How many gallons of water must be added toreturn the water to the proper level?A. 120,480 gallonsB. 3.123 gallonsC. 12,495 gallonsD. 15,000 gallons12. 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?A. 20 daysB. 10 daysC. 100 daysD. 1 day1 Exam Prep – Certified Pool Operator Handbook3
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?A. Once per weekB. Every 168 hoursC. When the influent and effluent gauges are 10 to 20 psi apartD. Whenever the pool manager tells you to14. In testing for Chlorine/Bromine in a commercial pool, DPD is preferred over OTO because:A. OTO bleaches out at high levels of chlorineB. DPD has a pleasant pink colorC. OTO only tests for Total ChlorineD. DPD smells funny15. Safety and rescue equipment should always be:A. Kept easily accessible around the poolB. Kept safely stored inside a locked roomC. Kept near the wading pool at all timesD. Kept in the pool manager's office16. Which type of filter system will remove the smallest micron particles?A. rapid rate sandB. cartridgeC. diatomaceous earthD. high rate sand17. If the pump fails to prime, which of the following does not have to be checked?A. leak on suction side of the pumpB. hair and lint cover is loose or has a worn 0-ringC. clogged skimmer basketD. filter system pressure is too high18. Oxidation Reduction Potential testing (ORP) is measured in?A. mVB. PPMC. GPMD. FAC19. High calcium hardness can result in what condition?A. etching of pool surfaceB. heater failureC. stainingD. cloudy water1 Exam Prep – Certified Pool Operator Handbook4
20. Head first entry dives are:A. only important in pools greater than 5 feet deepB. allowed only when patrons are young and athletic, never by very young or very oldpatronsC. only allowed in areas of the pool that are not marked as 'NO DIVING'D. not taught to the public anymore due to the extreme danger they present21. Opening and closing checklists:A. help note unsafe conditions at a facilityB. should include a check of the main drain coverC. will ensure proper deck clearance is maintained around the pool edgeD. all of the above22. You can become sick from ingesting water infected with Legionella bacteriaA. trueB. falseC. maybeD. depends on the pH of the water23. Channeling of filters occurs when:A. there is a leak in the filterB. the FMR is exceeded, and water cuts a channel through the mediaC. the water overflows in a filterD. all of the above24. The only physical factor that affects water balance is:A. pHB. TDSC. temperatureD. calcium hardness25. To be classified as a disinfectant, a compound must kill or inactivate 99.9% of contaminants as well as:A. maintaining proper water balanceB. leave a measurable residual in the waterC. have a NFPA classification ofD. have a sweet smelling aroma26. Pools using chlorine gas as a disinfectant produce hydrochloric acid, which can be neutralized with:A. sodium thiosulfateB. cyanuric acidC. caustic soda or soda ashD. carbon dioxide1 Exam Prep – Certified Pool Operator Handbook5
27. When balancing swimming pool water, the following should be adjusted first:A. pHB. calciumC. total alkalinityD. temperature28. A spa with water tested as pH 7.2, temperature 103, calcium hardness 600, total alkalinity 120, and tds of1,500 will be:A. scale formingB. balancedC. corrosiveD. sanitized29. When performing a water test, sample water should be collected:A. at the water surfaceB. 18 inches below the surface, near a return lineC. from the filter tankD. 18 inches below the surface, away from return line30. Swimming pool circulation systems should be adjusted to remove:A. 75% from the main drainB. 75% from the surfaceC. 50% from the main drain and 50% from the surfaceD. 100% from the surface31. Vaccuming of the pool bottom should be done:A. after foreign matter has settledB. as time permitsC. weeklyD. between noon and 2 p.m.32. You are a service tech and have gotten a contract to maintain a small motel pool. Upon examining theoperational records, you find that the number of gallons in the pool is not listed in the records. You visit thepool 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.A). What is the total number of gallons of water in this pool?A. 33,000 gallonsB. 60,000 gallonsC. 44,500 gallonsD. 330,000 gallons1 Exam Prep – Certified Pool Operator Handbook6
B). To achieve a 6 hour TOR in this pool, what flow rate would be needed?A. 192 gpmB. 92 gpmC. 920 gpmD. 75 gpmC). You notice a clear greenish tint to the water. What could be the problem?A. free-floating green algaeB. presence of ironC. presence of copperD. all of the above33. You are the aquatics manager at a very busy local gym that is open 24 hours per day, 7 days per week. Thisgym has a 1,850 gallon spa. This spa is in almost constant use with about 100 bathers per day using the spa (onaverage). You begin to get complaints from the bathers that their eyes are burning and their skin itches aftersoaking.A). What is the suggested replacement interval for the water in this spa?A. 60 daysB. 6 daysC. once monthlyD. dailyB). You drain the water from the spa and refill. Your main sanitizer is calcium hypochlorite. One morning yourtesting indicates that the free chlorine level is very high, at 15 ppm FAC, and there is no combined chlorine inthe water. You are not allowed to drain again, and are under pressure from the gym owner to get the spa openfor his clients. You realize that by using a chlorine neutralizer such as sodium thiosulfate, you can lower thechlorine to a more normal level. How much sodium thiosulfate should you add to the water to lower the FAClevel to 6 ppm?A. 43 ouncesB. 4.3 lbsC.4.3 ouncesD.14.3 lbs34. When performing a color matching water test, when using the comparator, you should:A. hold the comparator up to the direct sunlightB. be in a dimly lighted roomC. wear sunglasses and hold the comparator up to the sunlightD. hold the sample up to the northern hoizon or a daylight illuminator1 Exam Prep – Certified Pool Operator Handbook7
35. Which of the following would not be considered an acceptable ADA access method?A. a pool rampB. zero depth entry levelC. corner steps with a vertical rise of less than 11 inchesD. a portable lift36. According to the Certified Pool - Spa Operator Handbook, which of the following should result in theimmediate closure of a pool or spa?A. chlorine level reads 3.5 ppmB. ph level is 8.0C. total bromine reading is 5 ppmD. water circulation system is operating at the proper rate37. One cubic foot of water containsgallons.A. 7 48B. 8.33C. 62.4D. 64.238. One cubic foot of water weighspounds.A. 7 48B. 8.33C. 62.4D. 64.239. One gallon of water weighspounds.A. 7.48B 8.33C 62.4D. 64.240. How many ppm of combined chlorine (CC) must be added to a 32,000 gallon pool with a total chlorine (TC)of 2.4 and free chlorine (FC) of 1.3 to achieve breakpoint chlorination?A. 9 ppmB. 10 ppmC. 11 ppmD. 12 ppm41. What effect does gas chlorine have on pH in water?A. raisesB. lowersC.neutralizesD. none1 Exam Prep – Certified Pool Operator Handbook8
42. A round pool with a 25' diameter containssquare feet of surface area.A. 39.25B. 78.50C. 490.63D 1.962 5043. A round pool with a 20' diameter and a water depth of 5'-4" containsgallons of water.A. less than 12,400B. between 12.400 and 12,500C. between 12,501 and 12,600D. more than 12,60044. A rectangular swimming pool measuring 30' long by 15' wide with a water depth of 3' on the shallow endand 6' on the deep end will containgallons of water .A. less than 15.000B. between 15,000 and 15,100C. between 15.101 and 15,200D more than 15.20045. A spa with an 8' diameter having a water depth of 2'-8" will containpounds of water.A. 1.003.37B. 1,117.39C. 8,307.49D. 8,370 3946. What is the ideal range for total alkalinity?A 60 to 180 ppmB. 80 to 100 ppmC. 80 to 120 ppmD. 100 to 120 ppm47. The amount of unfiltered water is reduced toafter four turnovers.A. 2%B. 5%C. 16%D. 58%48. What is considered the necessary backwash rate to achieve proper agitation when backwashing sand filters?A. 8 gpm/sfB. 10 gpm/sfC. 15 gpm/sfD. 20 gpm/sf1 Exam Prep – Certified Pool Operator Handbook9
49. A diatomaceous earth filter containing six diatomaceous earth leaf elements each measuring 4' x 2.5' willprovide for a filter area of.A. 8' x 8'B. 11'x 11'C. 16' x 16'D. 20' x 20'50. A circular filter tank with a 3 foot diameter and a height of 4 feet, using a sand filter, will require a filtersurface area ofsquare feet. Select the closest answer.A. 4.71B. 7.07C. 9.42D. 28.2651. A rectangular swimming pool measuring 32' x 30', with an average water depth of 5' and a turnover rate of 6hours, will have a flow rate ofgallons per minute.A. 100. 00B. 114.00C. 387.14D. 598.4052. A 32 foot diameter public swimming pool with a pump flow rate of 80 gpm and a 6' water depth will have aturnover rate ofhours. Select the closest answer.A. 7.5B. 8.2C. 8.9D. 10.053. How many square inches does a filtering system with six 10" diameter diatomaceous earth filter leafelements contain?A. 471 square inchesB. 942 square inchesC. 1,884 square inchesD. 3,768 square inches54. A public swimming pool with a filter area of 48 square feet and filter media rate of 2-1/2 gpm per squarefoot of filter area will have a filter capacity of gallons. The required turnover rate for the pool is 6 hours.A. 24.000B. 36,000C. 43,200D. 44,4001 Exam Prep – Certified Pool Operator Handbook10
55. A 34,000 gallon public swimming pool with a filter media rate of 2 gpm per square foot of filter area willrequire a filter area ofsquare feet. The required pool turnover rate is 6 hours.A. 45 84B. 47 22C. 49.17D. 51.0456. According to the Certified Pool - Spa Operator Handbook, what percentage of energy loss is caused byevaporation?A. 5%B. 15 to 25%C. 20 to 30%D. 50%57. According to the Certified Pool - Spa Operator Handbook, a swimming pool with a pool capacity of 80,000gallons and a required 8 hour turnover will have a flow rate ofgpm.A. 156B. 167C. 208D. 22258. In general, the finer the filter media is the more successful the filtering process. Sand filters, for example,arethan diatomaceous earth filters.A. less effectiveB. more effectiveC. the sameD. 50% more effective59. A rapid sand filter is designed with a filtering rate of 3 gpm per square foot. The square feet of filter surfacearea required for a 40,000 gallon pool with an 8 hour turnover rate is:A. 21.54 square feetB. 24 47 square feetC. 27 78 square feetD. 37 04 square feet60. According to the Certified Pool - Spa Operator Handbook, to provide proper building protection andcomfort to users the humidity levels for indoor pools and spas should be maintained betweenA. 20 to 40%B. 30 to 50%C. 40 to 60%D. 50 to 70%1 Exam Prep – Certified Pool Operator Handbook11
61. What is the process of replacing used diatomaceous earth powder with fresh powder called?A. slurryingB. backwashingC. pre.coatingD. downwashing62. Surface-type cartridges have a single layer of filter media made ofcylindrical or oval core.attached in pleats to aA. synthetic fabricsB. sand particlesC. natural fabricsD. diatomaceous63. According to the Certified Pool - Spa Operator Handbook. the sizing of pump piping should not exceed avelocity offeet per second on the suction end.A. 4B. 6C. 8D. 1064.water.is the most common disinfectant used in the treatment and sanitation of swimming poolA ChlorineB. BromineC. Hypochlorous acidD. Munatic acid65. According to the Certified Pool - Spa Operator Handbook, chlorine remaining or added after breakpoint isreached exists as, and all the combined residual is oxidized.A. breakpoint chlorineB. oxidized chlorineC. free residual chlorineD. foul chlorine66. According to the Certified Pool - Spa Operator Handbook, the acceptable pH reading is:A. 7 2 to 7 6B. 7 0 to 7 8C. 7 2 to 7 8D. 7.2 to 8.01 Exam Prep – Certified Pool Operator Handbook12
67. When determining the degree of saturation and pool water the constant (12.1) includes a factor for TotalDissolved 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 ofshould be used for the constant.A. 12.2B. 12 3C. 12.4D. 12.568. Given: a swimming pool has the following water analysis:pHTotal alkalinityTemperatuteCalcium hardnessTotal dissolved solids less than7.250 ppm94 F150 ppm1,000 ppmAccording to the Certified Pool - Spa Operator Handbook, the pool water is:A perfectly balancedB. scale formingC. corrosiveD. acidic69. Water with a pH of less than 7.0 is said to be:A. alkalineB. saturatedC. acidicD. lionized70. According to the Certified Pool - Spa Operator Handbook, the ideal level for total water alkalinityisppmA. 80-120B. 100-125C. 125-150D. 140-16571. Spas and hot tubs require a higher level of chlorine than in swimming pools. The free available chlorineconcentration should be maintained atppm with hourly checks during heavy use.A. 2 0-4 0B. 3 0-5.0C. 4 0-6.0D. 5 0-7.01 Exam Prep – Certified Pool Operator Handbook13
72. According to the Certified Pool - Spa Operator Handbook, filtration and recirculation pumps shouldoperatehours continuously for public spas and therapy pools.A. 8B. 12C. 18D. 2473. According to the Certified Pool - Spa Operator Handbook, a spa with an 8' diameter, a water depth of 3 feetand an average of 32 bathers per 24 hours, will havedays before dumping.A. 11 to 12B. 13 to 14C. 15 to 16D. 17 to 1874. A spa with a 10' diameter and a water depth of 2'-8" with a water temperature of 55 F willrequirebtu's of heat to raise the water temperature to 102'fA. 230,502B. 395,173C. 430,642D. 615,43975. According to The Certified Pool Spa Operator Handbook, the amount of chlorine gas required to treat a7,500 gallon swimming pool isounces, using a chlorine gas dosage of 3. 5 ppm.A. 1.0B. 1.3C. 34D. 4 276. According to The Certified Pool - Spa Operator Handbook, a pool blanket can reduce heating costs by:A. 20% to 40%B. 30% to 50%C. 40% to 60%D. 50% to 70%77. A pool with a surface area of 1,800 sf closes at 9:30pm on Friday night. When it reopens on Tuesdaymorning at 8:00am the water surface is 2.25" lower than it was when the pool dosed. Assuming all water lostwas through leakage, what is the loss to the pool in gallons per hour?A. less than 28 gallons per hourB. between 28 and 32 gallons per hourC. between 32 and 36 gallons per hourD. greater than 36 gallons per hour1 Exam Prep – Certified Pool Operator Handbook14
78. The addition of Trichlor Tables to a swimming pool has what effect of the pH level?A. raises pHB. lowers pHC. neutralizes pHD. does not effect pH79. Heat loss to the ground from a pool through its sides, bottom, pipes and filters is called.A. radiationB. conductionC. convectionD. evaporation80. Water clarity is measured in units of.A. filter ratesB. mineral residueC. turbidityD. pH level81. Avalve has a vertical disc or wedge attached to a long threaded stem that when rotatedeither seals or unblocks the flow of water.A. gateB. globeC. checkD. butterfly82. The maximum acceptable level of cyanuric-acid is.A. 50 ppmB. 100 ppmC. 200 ppmD. 300 ppm83. What is the name of the area of a centrifugal pump that converts water energy from velocity to pressure?A. pistonB. impellerC. vacuumD. volute84. How much sodium bicarbonate should be added to a 2,000 gallon spa to increase the total alkalinity by14ppm?A. 392 ozB. 3.92 ozC. 6 27 ozD. 52.7 oz1 Exam Prep – Certified Pool Operator Handbook15
85. Pools of similar surface area located
1 Exam Prep – Certified Pool Operator Handbook 2 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 pH is 7.6 What is
