CPO Filtration and Circulation Systems 2

Question 1

What is the primary purpose of a multiport valve on a sand filter?

Accepted Answer

To direct water flow through different filter operating modes

Answer

To regulate chemical dosing

Answer

To control pump speed

Answer

To measure filter pressure

Question 2

During a backwash cycle on a sand filter, which direction does water flow through the filter bed?

Accepted Answer

Upward through the sand

Answer

Downward through the sand

Answer

Horizontally across the laterals

Answer

In a circular pattern around the tank

Question 3

A cartridge filter should be cleaned when the pressure differential between inlet and outlet reaches what threshold?

Accepted Answer

10 psi above starting pressure

Answer

5 psi above starting pressure

Answer

15 psi above starting pressure

Answer

20 psi above starting pressure

Question 4

What type of filter media is used in a diatomaceous earth (DE) filter?

Accepted Answer

Fossilized diatom skeletons coated on grids

Answer

Silica sand and anthracite

Answer

Crushed glass beads

Answer

Polyester fiber cartridges

Question 5

What is 'channeling' in a sand filter?

Accepted Answer

A condition where water bypasses the media through cracks or channels

Answer

The normal pathway water takes through clean sand

Answer

The process of adding new sand to the filter

Answer

A method of distributing water evenly across the sand surface

Question 6

What is the typical turnover rate requirement for a public swimming pool?

Accepted Answer

Every 6 hours

Answer

Every 2 hours

Answer

Every 12 hours

Answer

Every 24 hours

Question 7

Which component prevents backflow of water from the pool into the potable water supply when filling?

Accepted Answer

Air gap or backflow preventer

Answer

Pressure relief valve

Answer

Check valve

Answer

Gate valve