CPO Exam | Certified Pool Operator
Practice Exam | Correctly Answered and
Rated A+ | 2025/2026 Guide
When a pool has a deep end of more than 5 feet, it must have these two
things:
-Correct Answer-safety line and a slope line mark
Pools should have both horizontal and vertical depth markers no more than
-Correct Answer-25 feet apart
The algae that causes the most damage to a pool is
-Correct Answer-Black Algae
Low chlorine levels will cause ___ in the pool
-Correct Answer-Green Algae
The person responsible for keeping records at the pool is
-Correct Answer-pool operator
,If the pool is cloudy and you cannot see the main drain, what do you do?
-Correct Answer-Close the pool to swimmers
PH should be between ___ and ___
-Correct Answer-7.2 and 7.8
To raise pH you add...
-Correct Answer-Soda Ash
To lower pH you add
-Correct Answer-Muriatic acid
An acceptable level of bromine in a pool is
-Correct Answer-3.0 ppm
Chloramines are a combination of what in the pool?
-Correct Answer-chlorine and ammonia
To raise pH you need to add what to the pool
, -Correct Answer-Soda Ash
Cyanuric acid is used as a STABILIZER In the pool and can't exceed what
unit
-Correct Answer-50 parts per million (ppm)
If you add chlorine to the pool does it raise or lower the pH
-Correct Answer-It will raise pH
A filter backwash cycle is complete when?
-Correct Answer-When the backwash water appears clear in the sight glass
Algae primarily forms in a pool because?
-Correct Answer-poor circulation
When you cannot see the main drain at the bottom of the pool you do
what?
-Correct Answer-CLOSE POOL
Filtration is what?
Practice Exam | Correctly Answered and
Rated A+ | 2025/2026 Guide
When a pool has a deep end of more than 5 feet, it must have these two
things:
-Correct Answer-safety line and a slope line mark
Pools should have both horizontal and vertical depth markers no more than
-Correct Answer-25 feet apart
The algae that causes the most damage to a pool is
-Correct Answer-Black Algae
Low chlorine levels will cause ___ in the pool
-Correct Answer-Green Algae
The person responsible for keeping records at the pool is
-Correct Answer-pool operator
,If the pool is cloudy and you cannot see the main drain, what do you do?
-Correct Answer-Close the pool to swimmers
PH should be between ___ and ___
-Correct Answer-7.2 and 7.8
To raise pH you add...
-Correct Answer-Soda Ash
To lower pH you add
-Correct Answer-Muriatic acid
An acceptable level of bromine in a pool is
-Correct Answer-3.0 ppm
Chloramines are a combination of what in the pool?
-Correct Answer-chlorine and ammonia
To raise pH you need to add what to the pool
, -Correct Answer-Soda Ash
Cyanuric acid is used as a STABILIZER In the pool and can't exceed what
unit
-Correct Answer-50 parts per million (ppm)
If you add chlorine to the pool does it raise or lower the pH
-Correct Answer-It will raise pH
A filter backwash cycle is complete when?
-Correct Answer-When the backwash water appears clear in the sight glass
Algae primarily forms in a pool because?
-Correct Answer-poor circulation
When you cannot see the main drain at the bottom of the pool you do
what?
-Correct Answer-CLOSE POOL
Filtration is what?
