Pool and Spa Operator Handbook – Certified Pool & Spa Operator
(CPO) Certification Exam Questions with Verified Detailed
Answers (2025–2026 Edition)
Introduction:
This comprehensive study resource covers the Certified Pool & Spa
Operator (CPO) Certification exam material for the 2025–2026
edition. It includes 100+ verified and detailed questions with correct
answers based on the Pool and Spa Operator Handbook, following
NSPF and CDC standards. Topics include pool water chemistry,
chlorine and pH management, filtration and circulation systems,
water balance, spa operations, safety regulations, disinfection
methods, and problem-solving scenarios such as fecal contamination,
pH adjustment, and turnover rate calculations. Perfect for CPO
candidates and pool professionals preparing for certification or
recertification.
Exam Questions and Answers
34. When performing a color matching water test, when using the
comparator, you should: --- correct precise answer ---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? --- correct precise answer ---corner steps with
a vertical rise of less than 11 inches
,36. According to the Certified Pool - Spa Operator Handbook, which
of the following should result in the immediate closure of a pool or
spa? --- correct precise answer ---ph level is 8.0
37. One cubic foot of water contains gallons. --- correct precise
answer ---7.48
38. One cubic foot of water weighs pounds. --- correct precise
answer ---62.4
39. One gallon of water weighs pounds. --- correct precise answer -
--8.33
41. What effect does gas chlorine have on pH in water? --- correct
precise answer ---lowers
46. What is the ideal range for total alkalinity? --- correct precise
answer ---80 to 120 ppm
47. The amount of unfiltered water is reduced to after four
turnovers. --- correct precise answer ---2%
,48. What is considered the necessary backwash rate to achieve
proper agitation when backwashing sand filters? --- correct precise
answer ---15 gpm/sf
60. 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 --- correct precise answer ---40 to 60%
61. What is the process of replacing used diatomaceous earth
powder with fresh powder called? --- correct precise answer ---
pre.coating
66. According to the Certified Pool - Spa Operator Handbook, the
acceptable pH reading is: --- correct precise answer ---7 2 to 7 8
67. 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." --- correct precise answer ---12.2
69. Water with a pH of less than 7.0 is said to be: --- correct
precise answer ---acidic
, 70. According to the Certified Pool - Spa Operator Handbook, the
ideal level for total water alkalinity is ppm --- correct precise
answer ---80-120
71. 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. ---
correct precise answer ---3 0-5.0
72. According to the Certified Pool - Spa Operator Handbook,
filtration and recirculation pumps should operate _______________
hours continuously for public spas and therapy pools. --- correct
precise answer ---24
78. The addition of Trichlor Tables to a swimming pool has what
effect of the pH level? --- correct precise answer ---lowers pH
79. Heat loss to the ground from a pool through its sides, bottom,
pipes and filters is called . --- correct precise answer ---conduction
80. Water clarity is measured in units of . --- correct precise
answer ---turbidity
(CPO) Certification Exam Questions with Verified Detailed
Answers (2025–2026 Edition)
Introduction:
This comprehensive study resource covers the Certified Pool & Spa
Operator (CPO) Certification exam material for the 2025–2026
edition. It includes 100+ verified and detailed questions with correct
answers based on the Pool and Spa Operator Handbook, following
NSPF and CDC standards. Topics include pool water chemistry,
chlorine and pH management, filtration and circulation systems,
water balance, spa operations, safety regulations, disinfection
methods, and problem-solving scenarios such as fecal contamination,
pH adjustment, and turnover rate calculations. Perfect for CPO
candidates and pool professionals preparing for certification or
recertification.
Exam Questions and Answers
34. When performing a color matching water test, when using the
comparator, you should: --- correct precise answer ---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? --- correct precise answer ---corner steps with
a vertical rise of less than 11 inches
,36. According to the Certified Pool - Spa Operator Handbook, which
of the following should result in the immediate closure of a pool or
spa? --- correct precise answer ---ph level is 8.0
37. One cubic foot of water contains gallons. --- correct precise
answer ---7.48
38. One cubic foot of water weighs pounds. --- correct precise
answer ---62.4
39. One gallon of water weighs pounds. --- correct precise answer -
--8.33
41. What effect does gas chlorine have on pH in water? --- correct
precise answer ---lowers
46. What is the ideal range for total alkalinity? --- correct precise
answer ---80 to 120 ppm
47. The amount of unfiltered water is reduced to after four
turnovers. --- correct precise answer ---2%
,48. What is considered the necessary backwash rate to achieve
proper agitation when backwashing sand filters? --- correct precise
answer ---15 gpm/sf
60. 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 --- correct precise answer ---40 to 60%
61. What is the process of replacing used diatomaceous earth
powder with fresh powder called? --- correct precise answer ---
pre.coating
66. According to the Certified Pool - Spa Operator Handbook, the
acceptable pH reading is: --- correct precise answer ---7 2 to 7 8
67. 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." --- correct precise answer ---12.2
69. Water with a pH of less than 7.0 is said to be: --- correct
precise answer ---acidic
, 70. According to the Certified Pool - Spa Operator Handbook, the
ideal level for total water alkalinity is ppm --- correct precise
answer ---80-120
71. 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. ---
correct precise answer ---3 0-5.0
72. According to the Certified Pool - Spa Operator Handbook,
filtration and recirculation pumps should operate _______________
hours continuously for public spas and therapy pools. --- correct
precise answer ---24
78. The addition of Trichlor Tables to a swimming pool has what
effect of the pH level? --- correct precise answer ---lowers pH
79. Heat loss to the ground from a pool through its sides, bottom,
pipes and filters is called . --- correct precise answer ---conduction
80. Water clarity is measured in units of . --- correct precise
answer ---turbidity
