Certified Pool Operator Exam | Water
Chemistry, Filtration, and Safety Exam |
Questions and Answers Rated A+ |
Latest 2025/2026 Guide
What chemical should be used to raise low calcium hardness?
- Correct Answer - Calcium Chloride should be used to raise calcium
hardness.
What is the function of a skimmer weir?
- Correct Answer - A skimmer weir prevents floating debris from re-entering
the pool and directs floating debris towards the main drain.
What is the acceptable level of free chlorine in swimming pool water?
- Correct Answer - The acceptable level of free chlorine is 1 to 3 parts per
million (ppm).
What happens when alkalinity levels are low in pool water?
- Correct Answer - Low alkalinity levels make it difficult to maintain pH and
can damage the plaster of the pool surfaces.
,What is installed to designate a break in the area of the pool with a depth of
five feet or greater?
- Correct Answer - A safety line and a slope break marking on the pool floor
are installed.
Who is responsible for maintaining the daily pool log?
- Correct Answer - The certified pool operator is responsible for maintaining
the daily pool log.
When is a filter backwash cycle complete for a sand filter?
- Correct Answer - A filter backwash cycle is complete when the backwash
water appears clear in the sight glass.
In what forms can chlorine be used?
- Correct Answer - Chlorine can be used in gas, liquid, and powder forms.
What is the recommended hardness level for pool water?
- Correct Answer - Hardness is recommended to be maintained at 200 -
400 parts per million (ppm).
What is the acceptable level of bromine for a swimming pool?
, - Correct Answer - The acceptable level of bromine for a swimming pool is
3 ppm.
What can be added to lower the pH of swimming pool water?
- Correct Answer - Muriatic Acid can be added to lower the pH.
How is the volume of water going through a filter system measured?
- Correct Answer - The volume of water going through a filter system is
measured in gallons per minute.
What may cause air bubbles to come from the returns in the pool?
- Correct Answer - Air bubbles may be caused by damage to the return line
from the filter or a missing coping stone.
What chemical can reduce high levels of free chlorine?
- Correct Answer - Sodium Thiosulfate can be added to reduce high levels
of free chlorine.
What effect does adding liquid chlorine have on pH?
- Correct Answer - Adding liquid chlorine will lower the pH.
Chemistry, Filtration, and Safety Exam |
Questions and Answers Rated A+ |
Latest 2025/2026 Guide
What chemical should be used to raise low calcium hardness?
- Correct Answer - Calcium Chloride should be used to raise calcium
hardness.
What is the function of a skimmer weir?
- Correct Answer - A skimmer weir prevents floating debris from re-entering
the pool and directs floating debris towards the main drain.
What is the acceptable level of free chlorine in swimming pool water?
- Correct Answer - The acceptable level of free chlorine is 1 to 3 parts per
million (ppm).
What happens when alkalinity levels are low in pool water?
- Correct Answer - Low alkalinity levels make it difficult to maintain pH and
can damage the plaster of the pool surfaces.
,What is installed to designate a break in the area of the pool with a depth of
five feet or greater?
- Correct Answer - A safety line and a slope break marking on the pool floor
are installed.
Who is responsible for maintaining the daily pool log?
- Correct Answer - The certified pool operator is responsible for maintaining
the daily pool log.
When is a filter backwash cycle complete for a sand filter?
- Correct Answer - A filter backwash cycle is complete when the backwash
water appears clear in the sight glass.
In what forms can chlorine be used?
- Correct Answer - Chlorine can be used in gas, liquid, and powder forms.
What is the recommended hardness level for pool water?
- Correct Answer - Hardness is recommended to be maintained at 200 -
400 parts per million (ppm).
What is the acceptable level of bromine for a swimming pool?
, - Correct Answer - The acceptable level of bromine for a swimming pool is
3 ppm.
What can be added to lower the pH of swimming pool water?
- Correct Answer - Muriatic Acid can be added to lower the pH.
How is the volume of water going through a filter system measured?
- Correct Answer - The volume of water going through a filter system is
measured in gallons per minute.
What may cause air bubbles to come from the returns in the pool?
- Correct Answer - Air bubbles may be caused by damage to the return line
from the filter or a missing coping stone.
What chemical can reduce high levels of free chlorine?
- Correct Answer - Sodium Thiosulfate can be added to reduce high levels
of free chlorine.
What effect does adding liquid chlorine have on pH?
- Correct Answer - Adding liquid chlorine will lower the pH.
