Operation and Maintenance Flashcards
7 cards from real CPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Operation and Maintenance flashcards as text
A sand filter's pressure gauge reads 10 PSI above its clean starting pressure. What does this indicate and what action is required?
Answer: Backwash the filter to remove accumulated debris
A pressure rise of 8–10 PSI above the initial clean pressure indicates the filter media is dirty and backwashing is required to restore proper flow.
What is the maximum turnover rate most health codes require for a standard public swimming pool?
Answer: Every 6 hours
Most jurisdictions require a pool's entire water volume to pass through the filtration system at least once every 6 hours.
Which filter type provides the finest particle filtration, capable of removing particles as small as 2–5 microns?
Answer: Diatomaceous earth (DE) filter
Diatomaceous earth filters use fossilized diatom skeletons as the filter medium, allowing filtration down to 2–5 microns — the finest of common pool filter types.
What is the primary purpose of the pump strainer basket in a pool circulation system?
Answer: To catch hair, leaves, and debris before they reach the pump impeller
The pump strainer basket protects the pump impeller from damage by capturing large debris on the suction side of the pump.
During backwashing of a sand filter, in which direction does water flow through the filter bed?
Answer: Upward through the filter bed to lift and agitate the sand
Backwashing reverses the water flow upward through the sand, expanding and agitating the bed to flush trapped dirt out to the waste line.
What type of valve is installed on the suction line of a pool pump to prevent water from draining back when the pump shuts off?
Answer: Check valve
A check valve permits water flow in only one direction, maintaining pump prime by preventing backflow through the suction line when the pump is off.
What does 'static head' refer to in a pool hydraulic system?
Answer: The pressure created by the weight of standing water at rest
Static head is the pressure exerted by the weight of water in a non-flowing system, measured in feet of water column.