Pool & Spa Maintenance & Operations Flashcards

What is the recommended turnover rate for a standard commercial swimming pool?

Answer: Every 6 hours

Most health codes require commercial pools to turn over the entire water volume every 6 hours through the filtration system.

Which type of filter requires backwashing to clean it?

Answer: Both sand and DE filters

Both sand filters and diatomaceous earth (DE) filters use backwashing as their primary cleaning method, reversing water flow to flush out trapped debris.

When should a CPO operator perform a full water chemistry test?

Answer: At least twice daily during peak season

Commercial pool operators should test water chemistry at least twice daily, especially during periods of heavy bather load.

What is the primary purpose of a skimmer in pool operations?

Answer: To remove surface debris before it sinks

Skimmers draw water from the pool surface to remove floating debris such as leaves, oils, and insects before they sink and decompose.

A pool operator notices the pressure gauge on the filter is reading 10 psi above the clean starting pressure. What action is required?

Answer: Backwash or clean the filter

A pressure increase of 8–10 psi above the clean starting pressure indicates a dirty filter that needs backwashing or cleaning.

What chemical is used to lower the pH in pool water?

Answer: Muriatic acid or sodium bisulfate

Muriatic acid (hydrochloric acid) or dry acid (sodium bisulfate) are the most common chemicals used to lower pH in pool water.

What is 'channeling' in the context of a sand filter?

Answer: Water bypassing the filter media through pathways in the sand

Channeling occurs when water finds preferential pathways through the sand bed, bypassing the filter media and reducing filtration effectiveness.