CERTIFIED POOL OPERATOR 2 FULL REVIEW
SET 2026 QUESTIONS ANSWERS VERIFIED
◉ what does it mean if bubbles are coming from return line. Answer:
Air is coming form somewhere. Check the skimmer strainer basket
lid and gasket
◉ Flow meter. Answer: measures the amount of water passing
through pipes
◉ Flow meter measurement unit. Answer: Gallons per minutes GPM
◉ what does it mean if flow meter is showing lower flow than is
should?. Answer: Usually means the filter needs to be cleaned or
there is too much debris in the strainer basket or skimmer basket
◉ 3 Types of Filters. Answer: 1. Sand Filter
2. Cartridge Filter
3. D.E. Filter
◉ Filtration. Answer: the physical process of removing suspended
particles form pool water
, ◉ how to clean cartridge filter. Answer: soak cartridge in degreaser
and hose off
◉ how to clean a sand filter. Answer: backwash
◉ Backwash. Answer: the process of reverse flow of water through
the sand filter to remove accumulated particles
◉ when to backwash. Answer: when sand filter pressure gauge is
higher than usual (spa 8-10 or higher)
◉ when can you stop backwashing. Answer: when water in sight
glass appears to be clear
◉ how often should in a sand filter be replaced. Answer: every 3-5
years
◉ Channeling. Answer: a damaging condition that occurs over time
in sand filters. When sand becomes hard, water goes around sand
and unfiltered water returns to the pool
◉ most efficient type of filter and why. Answer: D.E. filter because it
can trap particles up to 3-5 microns
SET 2026 QUESTIONS ANSWERS VERIFIED
◉ what does it mean if bubbles are coming from return line. Answer:
Air is coming form somewhere. Check the skimmer strainer basket
lid and gasket
◉ Flow meter. Answer: measures the amount of water passing
through pipes
◉ Flow meter measurement unit. Answer: Gallons per minutes GPM
◉ what does it mean if flow meter is showing lower flow than is
should?. Answer: Usually means the filter needs to be cleaned or
there is too much debris in the strainer basket or skimmer basket
◉ 3 Types of Filters. Answer: 1. Sand Filter
2. Cartridge Filter
3. D.E. Filter
◉ Filtration. Answer: the physical process of removing suspended
particles form pool water
, ◉ how to clean cartridge filter. Answer: soak cartridge in degreaser
and hose off
◉ how to clean a sand filter. Answer: backwash
◉ Backwash. Answer: the process of reverse flow of water through
the sand filter to remove accumulated particles
◉ when to backwash. Answer: when sand filter pressure gauge is
higher than usual (spa 8-10 or higher)
◉ when can you stop backwashing. Answer: when water in sight
glass appears to be clear
◉ how often should in a sand filter be replaced. Answer: every 3-5
years
◉ Channeling. Answer: a damaging condition that occurs over time
in sand filters. When sand becomes hard, water goes around sand
and unfiltered water returns to the pool
◉ most efficient type of filter and why. Answer: D.E. filter because it
can trap particles up to 3-5 microns
