CPO CPO Filtration & Circulation Systems 2

Question 1

What is the function of a multiport valve on a sand filter?

Accepted Answer

To direct water flow for filtering, backwashing, rinsing, or bypassing

Answer

A multiport valve has multiple positions — filter, backwash, rinse, waste, recirculate, and closed — allowing the operator to direct flow for different operational needs.

Question 2

How often should sand filter media typically be replaced?

Accepted Answer

Every 3–5 years

Answer

Sand filter media should be replaced every 3–5 years as the grains wear smooth and lose the angular shape required for effective particle capture.

Question 3

What does 'DE fingering' indicate in a DE filter?

Accepted Answer

DE powder breaking through damaged filter grids into the pool

Answer

DE fingering occurs when diatomaceous earth powder passes through torn or damaged filter grids and enters the pool water, turning it cloudy white.

Question 4

What is the purpose of return inlets in a pool circulation system?

Accepted Answer

To introduce filtered and chemically treated water back into the pool

Answer

Return inlets complete the circulation loop by directing filtered and chemically balanced water back into the pool, ensuring proper distribution throughout the basin.

Question 5

Why must return inlets be strategically positioned in a pool?

Accepted Answer

To create circulation patterns that eliminate dead zones where bacteria can grow

Answer

Properly positioned return inlets create circulation patterns that prevent stagnant dead zones, ensuring all areas of the pool receive adequate filtration and chemical treatment.

(CPO) Certified Pool and Spa Operator Practice Test

(CPO) Certified Pool and Spa Operator Practice Test

CPO CPO Filtration & Circulation Systems 2