CPO Pool Water Chemistry Questions and Answers 2

Question 1

What is the ideal pH range for a chlorinated swimming pool?

Accepted Answer

7.2 to 7.6

Answer

6.8 to 7.0

Answer

7.8 to 8.2

Answer

8.0 to 8.4

Question 2

What is the function of total alkalinity in pool water chemistry?

Accepted Answer

To act as a pH buffer resisting rapid pH changes

Answer

To sanitize the water

Answer

To increase calcium hardness

Answer

To improve water clarity

Question 3

What causes high pH in pool water and how should it be corrected?

Accepted Answer

Aeration, high-pH chemical additions, or high alkalinity; add muriatic acid or sodium bisulfate

Answer

High chlorine, reduce chlorine feed

Answer

Too many swimmers, reduce bather load

Answer

Sunlight exposure, cover the pool

Question 4

What is the recommended calcium hardness range for a plaster pool?

Accepted Answer

200 to 400 ppm

Answer

50 to 100 ppm

Answer

100 to 150 ppm

Answer

500 to 700 ppm

Question 5

What chemical is used to raise total alkalinity without significantly affecting pH?

Accepted Answer

Sodium bicarbonate (baking soda)

Answer

Soda ash (sodium carbonate)

Answer

Calcium chloride

Answer

Muriatic acid

Question 6

Why does rain typically cause pool pH and alkalinity to drop?

Accepted Answer

Rainwater is naturally acidic and dilutes the pool's buffering capacity

Answer

Rain adds chlorine to the pool

Answer

Rain raises the water temperature

Answer

Rain has no significant effect on pool chemistry