CPO CPO Filtration & Circulation Systems

Question 1

What is the standard turnover rate required for most public swimming pools?

Accepted Answer

6 hours

Answer

12 hours

Answer

24 hours

Answer

3 hours

Question 2

When should a sand filter be backwashed?

Accepted Answer

When pressure rises 8–10 psi above the clean operating pressure

Answer

Every 24 hours regardless of pressure

Answer

When water turns cloudy

Answer

When pressure drops 5 psi below normal

Question 3

What is the primary purpose of a hair and lint strainer (pump strainer basket)?

Accepted Answer

To protect the pump impeller from debris damage

Answer

To balance pool pH

Answer

To measure chlorine levels

Answer

To remove algae from water

Question 4

What filtering medium is used in a diatomaceous earth (DE) filter?

Accepted Answer

Fossilized algae powder coated onto filter grids

Answer

Fine sand

Answer

Polyester fiber

Answer

Crushed glass

Question 5

What causes 'channeling' in a sand filter?

Accepted Answer

Water finding preferential paths through worn sand instead of flowing evenly

Answer

Excess chlorine breaking down the sand

Answer

Backwashing too frequently

Answer

Using the wrong grade of sand

Question 6

What is the main water conservation advantage of a cartridge filter over a sand filter?

Accepted Answer

It does not require backwashing, saving significant water during maintenance

Answer

It requires less pool makeup water

Answer

It operates at lower flow rates

Answer

It uses recycled water for cleaning