EXAM|WITH ACCURATE QUESTIONS AND VERIFIED
ANSWERS|GRADED A
The percentage of hypoclorous acid formation is most influenced by:
Ans✓✓✓ pH
Pool painting is usually done: Ans✓✓✓ Before opening in the spring
When a pool is chlorinated with gas chlorine, the operator must also use:
Ans✓✓✓ Soda Ash
The term "chlorine demand" refers to: Ans✓✓✓ The amount of chlorine
which will react with substances in the pool
Re-circulation pumps used in swimming pools are the type called:
Ans✓✓✓ Centrifugal pumps
Reversing the flow of water through the filters is called: Ans✓✓✓
Backwash
"Slurry feed" or "body feed" refers to: Ans✓✓✓ Diatomite added during
a filter run
The term pH is determined by the concentration of: Ans✓✓✓ Hydrogen
ions
, Because carbonate ions combine with hydrogen ions, sodium carbonate
will cause pH to: Ans✓✓✓ Rise
When enough chlorine is added to cause complete oxidation of all
organic compounds, a sudden drop in residual chlorine may be noticed.
The point at which this occurs is called the: Ans✓✓✓ Break-point
"Residual chlorine" refers to: Ans✓✓✓ The amount left in the water
after oxidation of organic material
Which of the following is NOT considered a swimming pool
disinfectant: Ans✓✓✓ Chlorinated hydrocarbons
When chlorine is used as a disinfectant for swimming pools, the form in
which it's disinfectant properties are the greatest is: Ans✓✓✓
Hypochlorous acid
The chemical most commonly used to raise pH is: Ans✓✓✓ Sodium
carbonate
An example of a chemical used to stabilize chlorine is: Ans✓✓✓
Cyanuric acid