2017 Certified Pool Operator HandbookPractice Test

1. 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 is 1.5pH is 7.4

Your 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 the following:

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 above

2. 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 gallons

3. 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 water

4. 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 number

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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 1.4 and pH is 7.6

What is the level of chloramines in this pool?

A. 3.6B. .8C. -.8D. 2.8

6. 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 gallons

C). 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 is 50 ppmpH is 7.2Calcium Hardness is 150 ppmTemperature is 76 degrees FTotal Dissolved Solids is 500 ppm

Using these readings, what is the Saturation Index for this pool?

A. +0.8B. +0.3C. -0.8D. -8.0

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8. 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 Chloride

9. 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 Thiosulfate

10. 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 gallons

12. You are the operator of a 3,000 gallon health club spa, which has an average of 100 users per day. Accordingto the CPO Handbook, how often should the water in this spa be changed?

A. 20 daysB. 10 daysC. 100 daysD. 1 day

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 to

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14. 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 funny

15. 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 office

16. Which type of filter system will remove the smallest micron particles?

A. rapid rate sandB. cartridgeC. diatomaceous earthD. high rate sand

17. 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 high

18. Oxidation Reduction Potential testing (ORP) is measured in?

A. mVB. PPMC. GPMD. FAC

19. High calcium hardness can result in what condition?

A. etching of pool surfaceB. heater failureC. stainingD. cloudy water

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 present

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21. 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 above

22. You can become sick from ingesting water infected with Legionella bacteria

A. trueB. falseC. maybeD. depends on the pH of the water

23. 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 above

24. The only physical factor that affects water balance is:

A. pHB. TDSC. temperatureD. calcium hardness

25. 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 aroma

26. 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 dioxide

27. When balancing swimming pool water, the following should be adjusted first:

A. pHB. calciumC. total alkalinityD. temperature

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28. 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. sanitized

29. 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 line

30. 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 surface

31. Vacuuming 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 the pooland 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 gallons

B). To achieve a 6 hour TOR in this pool, what flow rate would be needed?

A. 192 gpmB. 92 gpmC. 920 gpmD. 75 gpm

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C). 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 above

33. 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. daily

B). You drain the water from the spa and refill. Your main sanitizer is calcium hypochlorite. One morning your testing indicates that the free chlorine level is very high, at 15 ppm FAC, and there is no combined chlorine in the water. You are not allowed to drain again, and are under pressure from the gym owner to get the spa open for his clients. You realize that by using a chlorine neutralizer such as sodium thiosulfate, you can lower the chlorine to a more normal level. How much sodium thiosulfate should you add to the water to lower the FAC level to 6 ppm?

A. 43 ouncesB. 4.3 lbsC.4.3 ouncesD.14.3 lbs

34. 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 horizon opposite the sun or a daylight illuminator

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 lift

36. 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 rate

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37. One cubic foot of water contains gallons.

A. 7.48B. 8.33C. 62.4D. 64.2

38. One cubic foot of water weighs pounds.

A. 7 48B. 8.33C. 62.4D. 64.2

39. One gallon of water weighs pounds.

A. 7.48B. 8.33C. 62.4D. 64.2

40. 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 ppm

41. What effect does gas chlorine have on pH in water?

A. raisesB. lowersC.neutralizesD. none

42. A round pool with a 25' diameter contains square feet of surface area.

A. 39.25B. 78.50C. 490.63D 1.962 50

43. A round pool with a 20' diameter and a water depth of 5'-4" contains gallons of water.

A. less than 12,400B. between 12.400 and 12,500C. between 12,501 and 12,600D. more than 12,600

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44. 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 contain gallons of water.

A. less than 15,000B. between 15,000 and 15,100C. between 15,101 and 15,200D more than 15,200

45. A spa with an 8' diameter having a water depth of 2'-8" will contain pounds of water.

A. 1,003.37B. 1,117.39C. 8,307.49D. 8,370 39

46. What is the ideal range for total alkalinity?

A. 60 to 180 ppmB. 80 to 100 ppmC. 80 to 120 ppmD. 100 to 120 ppm

47. The amount of unfiltered water is reduced to after 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/sf

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 of square feet. Select the closest answer.

A. 4.71B. 7.07C. 9.42D. 28.26

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51. 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 of gallons per minute.

A. 100. 00B. 114.00C. 387.14D. 598.40

52. A 32 foot diameter public swimming pool with a pump flow rate of 80 gpm and a 6' water depth will have aturnover rate of hours. Select the closest answer.

A. 7.5B. 8.2C. 8.9D. 10.0

53. 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 inches

54. 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. 44,400

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 of square feet. The required pool turnover rate is 6 hours.

A. 45.84B. 47.22C. 49.17D. 51.04

56. 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%

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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 of gpm.

A. 156B. 167C. 208D. 222

58. In general, the finer the filter media is the more successful the filtering process. Sand filters, for example,are than diatomaceous earth filters.

A. less effectiveB. more effectiveC. the sameD. 50% more effective

59. 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 feet

60. 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 between

A. 20 to 40%B. 30 to 50%C. 40 to 60%D. 50 to 70%

61. What is the process of replacing used diatomaceous earth powder with fresh powder called?

A. slurryingB. backwashingC. pre.coatingD. downwashing

62. Surface-type cartridges have a single layer of filter media made of attached in pleats to a cylindrical or oval core.

A. synthetic fabricsB. sand particlesC. natural fabricsD. diatomaceous

63. Combined chlorine is the difference between __________________________.

A. total chlorine and combined chlorineB. total chlorine and free chlorineC. free chlorine and breakpoint chlorinationD. chloramines and free chlorine

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64. is the most common disinfectant used in the treatment and sanitation of swimming poolwater.

A ChlorineB. Sodium HypochloriteC. Hypochlorous acidD. Muriatic acid

65. The most common standard turnover rate required in codes for spas is no more than ________________.

A. 30 minutesB. 1 hourC. 4 hoursD. 12 hours

66. 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 8.0

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 of should be used for the constant.

A. 12.2B. 12 3C. 12.4D. 12.5

68. Given: a swimming pool has the following water analysis:

pH 7.2Total alkalinity 50 ppmTemperatute 94 FCalcium hardness 150 ppmTotal dissolved solids less than 1,000 ppm

According to the Certified Pool - Spa Operator Handbook, the pool water is:

A perfectly balancedB. scale formingC. corrosiveD. acidic

69. Water with a pH of less than 7.0 is said to be:

A. alkalineB. saturatedC. acidicD. lionized

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70. According to the Certified Pool - Spa Operator Handbook, the ideal level for total water alkalinityis ppm

A. 80-120B. 100-125C. 125-150D. 140-165

71. Spas and hot tubs require a higher level of chlorine than in swimming pools. The free available chlorineconcentration should be maintained at ppm with hourly checks during heavy use.

A. 2 0-4 0B. 3 0-5.0C. 4 0-6.0D. 5 0-7.0

72. According to the Certified Pool - Spa Operator Handbook, filtration and recirculation pumps shouldoperate _______________ hours continuously for public spas and therapy pools.

A. 8B. 12C. 18D. 24

73. 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 have days before dumping.

A. 11 to 12B. 13 to 14C. 15 to 16D. 17 to 18

74. A spa with a 10' diameter and a water depth of 2'-8" with a water temperature of 55°F willrequire btu's of heat to raise the water temperature to 102'f

A. 230,502B. 395,173C. 430,642D. 615,439

75. According to The Certified Pool Spa Operator Handbook, the amount of chlorine gas required to treat a7,500 gallon swimming pool is ounces, using a chlorine gas dosage of 3. 5 ppm.

A. 1.0B. 1.3C. 3.4D. 4.2

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76. 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 hour

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 affect pH

79. Heat loss to the ground from a pool through its sides, bottom, pipes and filters is called .

A. radiationB. conductionC. convectionD. evaporation

80. Water clarity is measured in units of .

A. filter ratesB. mineral residueC. turbidityD. pH level

81. 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.

A. gateB. globeC. checkD. butterfly

82. According to the Certified Pool - Spa Operator Handbook, cyanuric acid levels shall not exceed local healthcodes. In many cases the limit is ppm.

A. 50 ppmB. 100 ppmC. 200 ppmD. 300 ppm

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83. What is the name of the area of a centrifugal pump that converts water energy from velocity to pressure?

A. pistonB. impellerC. vacuumD. volute

84. 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 oz

85. Pools of similar surface area located in the same geographical region, but with differing water depths willhave the same .

A. filtering systemB. chemical dosagesC. pumpsD. surface heat loss

86. A spa holds 900 gallons of 65° F water, Btu's will he required to heat the water to 105° F. Do not include heat loss while bringing the spa up to temperature.

A. 300,000B. 277,350C. 225,000D. 245,000

87. According to The Certified Pool - Spa Operator Handbook, pressure head is calculated by multiplying thepsi by .

A. 2.31B. 4.32C. .231D. .453

88. 1 pound per square inch (psi) is the pressure created by a column of water feet high.

A. 2.31B. 1.131C. .833D. .432

89. In a pool containing 35,000 gallons which is 15 x 40 ft with the temp of 65 degrees F, BTU’swould be required to raise the water temperature to 75 degrees F if the air temp is 65 degrees F.

A. 2,915,500B. 2,921,000C. 2,932,000D. 2,943,000

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90. To raise FC in a 20,000 gallon pool by 2.0 ppm would require ounces of calcium hypochlorite.

A. 2B. 4C. 6D. 8

91. Pool surface area accounts for percent of heat loss.

A. 50B. 60C. 75D. 95

92. Green water that is transparent is usually due to .

A. copper ions in the waterB. precipitated ionsC. mustard algaeD. dissolved solids

93. If there are 5 bathers per day in a 700 gallon spa, in how many days will it be necessary to replacethe water?

A. 46B. 180C. 365D. 234

94. You are hired as a contractor for a pool that is 200 feet long by 65 feet wide. The pool is divided into 2sections, a swimming area & diving well. The swimming area is 65 feet wide and is 150 feet long. It has a depthranging from 3 ft to 5 ft. The remaining 50 feet has a constant depth of 18 feet. How many gallons are in thispool?

A. 1,023.750B. 731,250C. 788.50D. 8,675,309

95. A coagulation is the process of separating or precipitating in water.

A. solids suspendedB. stains and scaleC. algaeD. phosphates

96. Pool water a temp of 75 degrees F is equal to Celsius.

A. 22.1B. 23.1C. 23.9D. 24.5

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97. Pool water a temp of degrees F is equal to 22 degrees Celsius.

A. 71.6B. 72.8C. 73.4D. 74.1

98. A pool containing 18,500 gallons has an equal metric volume of liters.

A. 55,667B. 64,444C. 70,022D. 86,140

99. The most widely accepted flow rate for rapid rate sand filters in a public pool is per sq. ft.

A. 1.5 gpmB. 3 gpmC. 4 gpmD. 20 gpm

100. The flow requirement of a rapid rate sand filter during backwashing is gpm per sq. ft.

A. 5-8B. 8-12C. 12-15D. 15-18

101. The backwash ratio for high rate sand filters is .

A. 1:1B. 1:2C. 1:3D. 1:1/2

102. is the maximum flow rate per sq. ft. for both pressure and vacuum type DE filters inpublic pools without slurry.

A. 1 gpmB. 2 gpmC. 2.5 gpmD. 3 gpm

103. The commonly accepted amount of precoat for DE filters is ____ pounds per each sq. ft. of surface area.

A. 1B. 1.5C. .125D. .15

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104. To destroy harmful organisms in pool water, the accepted minimum of free chlorine is ____ ppm and manyhealth codes set the maximum FC at ppm.

A. 1, 5B. 2, 5C. 2, 3D. 2, 6

105. With an incident of diarrheal discharge in a pool, the free available chlorine should be raised to_____ ppm.

A. 8B. 10C. 15D. 20

106. Chlorine added after the breakpoint is reached will exist as .

A. free chlorineB. chloraminesC. combined chlorine residualD. hypochlorites

107. Sodium hypochlorite in its commercial form contains percent available chlorine.

A. 8-10B. 10-12C. 12-15D. 15-20

108. Calcium hypochlorite contains percent available chlorine by weight.

A. 65B. 60C. 80D. 95

109. Bromine is similar in many respects to chlorine, however, bromine cannot be used for .

A. stabilizationB. sanitationC. cleaningD. disinfectant

110. The solid chlorine compound which is used when a slow release of chlorine over time is desired iscalled .

A. lithium hypochoriteB. sodium dichlorC. dichlorD. trichlor

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111. Proper pH control of provides better chlorine efficiency.

A. 6.0-6.6B. 6.6-7.2C. 7.2-7.4D. 7.6-8.4

112. Pool water with a TDS of 900 ppm, a temp of 75 degree F, a pH of 7.3, total alkalinity of 75 ppm, andcalcium hardness of 200 ppm will have a saturation index of .

A. -0.4B. -0.3C. 0.3D. 0.4

113. It is essential to maintain total alkalinity at ppm in plaster pools.

A. 60-80B. 80-120C. 125-150D. 150-200

114. To control scaling, pool water that exceeds ppm hardness should be diluted or replaced with water of substantially lower hardness.

A. 200-400B. 400-600C. 600-800D. 800-1000

115. In determining cost for heating, it is best to size the heater to the number of gallons of water in the spa andin the spa and to the desired temperature. BTUs will heat 1 gallon of water 1 degree F.

A. 7.48B. 8.33C. 8.94D. 9.84

116. A _________ is used to radiate the high temperature of the water and cool it enough to allow the remainderof the circulation piping to the PVC.

A. Heat sinkB. BushingC. Shaft sealD. Bearing

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2017 Certified Pool Operator HandbookAnswer Key - Practice Test

Ques. Ans. Page

1. B 40

2. B 74

3. C 51

4. B 76

5. B 76

6. A) D 77

B) B 77

C) A 77

7. C 69

8. B 65

9. A 63

10. C 74

11. C 32

12. B 172

13. C 144

14. C 93

15. A 187

16. C 140

17. D 221

18. A 95

19. D 65

20. C 181

21. D 204

22. B 43

23. B 141

24. C 66

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25. B 49

26. C 55

27. C 69

28. A 69

29. D 90

30. B 123

31. A 213

32. A) A 28

B) B 121

C) C 80

33. A) B 172

B) C 73

34. D 91

35. C 236

36. B 3

37. A 26

38. C 26

Solution: 7.48 x 8.33 = 62.31 (62.4)

39. B 26

40. C 77

Solution: 10 x CC where CC = TC - FC

10 x (2.4 - 1.3)

10 x 1.1 = 11 ppm

41. B 52 Table 5-2

42. C 23

Solution: A= 3.14 x r x r

A = 3.14 x 12.5x 12.5 = 490.63

43 C 26 & 29

Solution: Volume (gals.) = 3.14 x (r x r) x depth x 7.50

Gals = 3.14 x (10 x 10) x 5.33 x 7.50 = 12,552.15

44. C 26 & 29

Solution: Avg. depth = 6 + 3 ÷ 2 = 4.5

volume (gals) = L x W x D x 7.50

30 x 15 x 4.5 x 7.50 = 15,187.50

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45. D 26 & 29

Solution: lbs. = 3.14 x (r x r) x depth x 62.4

lbs = 3.14 x (4 x 4) x 2.67 x 62.4 = 8,370.39

46. C 64

47. A 120 (Illustration 10-2)

48. C 145

49. B 148-150, but trade knowledge re D.E. filters also

Solution: 4' x 2.5' x 6 elements x 2 sides -= 120 sq. ft of filter surface area

√ 120 = 10.95' = 11'

50. B 29

Solution: Area = 3.14 x (r x r)

Area = 3.14 x (1 5 x 1.5) = 7.07 sq. ft

51. A 29 & 121

Solution: F. R = pool vol. (gals)

turnover time x 60

32 x 30 x 5 x 7.50 = 36 000 = 100.00 gpm

(6 x 60) 360

52. A 29 & 121

TR. = pool vol. (gals.) = 3.14 x (16 x 16) x 6 x 7 50 =

F R. of pump x 60 80 gal.x 60

36,172.8 = 7.54 hours

4,800

53. B 29

Solution: π x (r x r) x # sides x # leafs = square inches

3.14 x (5 x 5) x 2 x 6 = 942 square inches

54. C 121 & 142

Solution: Combine formula for Filter Area & Flow Rate, solving for Gallons (Volume)

Gallons = Turnover Rate x 60 x Filter Area x Filter Media Rate

Gallons = 6 x 60 x 48 x 2.5 = 43,200 gallons

55. B 121 & 142 (Solution: Combine formula)

Solution: Filter Area = volume (gals) ÷ filter media rate ÷ (Turnover Rate x 60)

34,000 ÷ 2 ÷ (6 x 60)

34.000 ÷ 2 ÷ 360 = 47.22 sq. ft.

56. D 153

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57. B 121

Flow Rate = Pool Volume ÷ Turnover Rate ÷ 60

Solution: 80,000 ÷ (8 x 60) = gpm

80,000 ÷ 480 = 166.67 gpm

58. A 140, Illustration 11-1

59. C 142

Solution: Filter Area = volume (gals) ÷ filter media rate ÷ (Turnover Rate. x 60)

40,000 ÷ 3 ÷ (8 x 60)

40.000 ÷ 3 ÷ 480 = 27.78 sq. ft.

60. C 155

61. C 149

62. A 147

63. B 76

64. A 49

65. A 168

66. C 63

67. A 69, Illustration 6-7

68. C 69, Illustration 6-8

Solution: Formula = pH + Tf + Cf + Af - 12.1

7.2 + .8 + 1.8+ 1,7 - 12.1 = -0.6

-0.6 = corrosive

69. C 291 (pH)

70. A 64

71. B 169

72. D 168

73. A 29 & 172

Solution: Formula = volume (gals.) ÷ 3 ÷ # of users/24 hours

Volume = 3.14 x (r x r) x 3 x 7 50 ÷3 = 3.14 x (4 x 4) x 3 x 7.50 ÷3= 11.78 days

74. D 29 & 159

Solution: Heater BTU = volume (gals.) x 8.33 x temp. difference

3.14 x (5 x 5) x 2.67 x 7.50 x 8.33 x 47 = 615,439.04

75. C 262 & 74

1.3 oz x 3.5 ppm ÷ 10,000 gals. x 7,500 gals. = 3.41 oz .

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76. D 155

77. B 29 & 32

Solution: 1,800sf x 2.25”÷ 12 = 337.50 cf x 7.50 gal/cf = 2,531.25 gallons

9:30pm Friday to 8:00am Tuesday = 82.50 hours

2,531 25 gallons - 82.50 hours = 30.68 gal/hr

78. B 56

79. B 154

80. C 140

81. A 130 and Trade Knowledge

82. B 3

83. D 128

84. C 262 & 74

Solution: 1.4 lbs to increase 10 ppm in 10,000 gal

1.4 lbs x 14 ppm ÷ 10ppm x 2,000 gal ÷ 10,000 gal = .392 lbs x 16 oz /lbs = 6.272 oz

85. D Trade Knowledge

86. A 159

Solution: BTU’s = Gallons x 8.33 x temp rise

900 x 8.33 x 40 = 299,880

87. A 270

88. A 26

89. A 159

Solution: Heater BTU = volume (gals.) x 8.33 x temp. difference

35,000 x 8.33 x 10 = 2,915,500

90. D 74 & 262

91. A 153-154

92. A 80

93. A 172

Solution: Replacement Interval (days) = spa gals ÷ 3 ÷ users per day

700 ÷ 3 ÷ 5 = 46.6

94. B 28-31

Solution: 65 x 150(area) x 4(avg. depth) x 7.5 = 292,500

65 x 50 x 18 x 7.5 = 438,750

292,500 + 438,750 = 731,250

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95. A 287

96. C 26

Solution: 0.5555555 (or 5/9) x (75 - 32) = 23.9

97. A 26

Solution: 1.8 x 22 + 32 = 71.6

98. C 26

Solution: 18,500 x 3.785 = 70,022.5

99. B 141 Table 11-1

100. C 146

101. A 145

102. B 141 Table 11-1

103. C 149

104. A 51

105. D 41

106. A 76-78

107. B 52, Table 5.2

108. A 50 & 286

109. A 58

110. D 56

111. C 63

112. A 69

Solution: Saturation Index (SI) = pH + Tf + Cf + Af - 12.1

SI = 7.3 + .6 + 1.9 + 1.9 - 12.1 = -0.4

113. B 64

114. D 65-66

115. B 158-159

116. A 133-134

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