CERTIFIED POOL OPERATOR TESTS 2
PRACTICE EVALUATION 2026 QUESTION BANK
FULL SOLUTION SET
◉ Oxidation Reduction Potential (ORP).
Answer: Measured in millivolts (mV) for water quality.
◉ High Calcium Hardness Effects.
Answer: Can cause staining and cloudy water.
◉ Head First Dives.
Answer: Not taught due to safety concerns.
◉ Opening and Closing Checklists.
Answer: Ensure safety and maintenance of pool.
◉ Legionella Bacteria Risk.
Answer: Can cause illness from contaminated water.
◉ Channeling in Filters.
Answer: Occurs when flow exceeds filter media capacity.
,◉ Disinfectant.
Answer: A compound must kill or inactivate 99.9% of contaminants
as well as leave a measurable residual in the water.
◉ Chlorine Gas.
Answer: Produces hydrochloric acid, which can be neutralized with
sodium thiosulfate, cyanuric acid, caustic soda or soda ash, or
carbon dioxide.
◉ Water Testing Sample Collection.
Answer: Sample water should be collected 18 inches below the
surface, near a return line.
◉ Swimming Pool Circulation Adjustment.
Answer: Should be adjusted to remove 75% from the surface.
◉ Vacuuming Pool Bottom.
Answer: Should be done after foreign matter has settled.
◉ Pool Volume Calculation.
Answer: A rectangular concrete pool measuring 40 feet by 20 feet
with a depth ranging from 3 feet to 8 feet contains 33,000 gallons.
, ◉ Turnover Rate (TOR).
Answer: To achieve a 6 hour TOR in a pool, a flow rate of 920 gpm
would be needed.
◉ Spa Water Replacement Interval.
Answer: The suggested replacement interval for the water in a spa
with 100 bathers per day is 6 days.
◉ Chlorine Neutralization.
Answer: To lower the FAC level from 15 ppm to 6 ppm, 43 ounces of
sodium thiosulfate should be added.
◉ Color Matching Water Test.
Answer: When using the comparator, hold the sample up to the
northern horizon or a daylight illuminator.
◉ ADA Access Methods.
Answer: Corner steps with a vertical rise of less than 11 inches
would not be considered an acceptable ADA access method.
◉ Pool Closure Criteria.
PRACTICE EVALUATION 2026 QUESTION BANK
FULL SOLUTION SET
◉ Oxidation Reduction Potential (ORP).
Answer: Measured in millivolts (mV) for water quality.
◉ High Calcium Hardness Effects.
Answer: Can cause staining and cloudy water.
◉ Head First Dives.
Answer: Not taught due to safety concerns.
◉ Opening and Closing Checklists.
Answer: Ensure safety and maintenance of pool.
◉ Legionella Bacteria Risk.
Answer: Can cause illness from contaminated water.
◉ Channeling in Filters.
Answer: Occurs when flow exceeds filter media capacity.
,◉ Disinfectant.
Answer: A compound must kill or inactivate 99.9% of contaminants
as well as leave a measurable residual in the water.
◉ Chlorine Gas.
Answer: Produces hydrochloric acid, which can be neutralized with
sodium thiosulfate, cyanuric acid, caustic soda or soda ash, or
carbon dioxide.
◉ Water Testing Sample Collection.
Answer: Sample water should be collected 18 inches below the
surface, near a return line.
◉ Swimming Pool Circulation Adjustment.
Answer: Should be adjusted to remove 75% from the surface.
◉ Vacuuming Pool Bottom.
Answer: Should be done after foreign matter has settled.
◉ Pool Volume Calculation.
Answer: A rectangular concrete pool measuring 40 feet by 20 feet
with a depth ranging from 3 feet to 8 feet contains 33,000 gallons.
, ◉ Turnover Rate (TOR).
Answer: To achieve a 6 hour TOR in a pool, a flow rate of 920 gpm
would be needed.
◉ Spa Water Replacement Interval.
Answer: The suggested replacement interval for the water in a spa
with 100 bathers per day is 6 days.
◉ Chlorine Neutralization.
Answer: To lower the FAC level from 15 ppm to 6 ppm, 43 ounces of
sodium thiosulfate should be added.
◉ Color Matching Water Test.
Answer: When using the comparator, hold the sample up to the
northern horizon or a daylight illuminator.
◉ ADA Access Methods.
Answer: Corner steps with a vertical rise of less than 11 inches
would not be considered an acceptable ADA access method.
◉ Pool Closure Criteria.
