Filtration and Circulation Systems 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 Filtration and Circulation Systems flashcards as text
What is the purpose of the 'waste' position on a multiport valve?
Answer: To drain backwash water and lower pool water level without passing through the filter
The Waste position bypasses the filter entirely and routes water directly to drain, used for vacuuming to waste or lowering the pool level.
Zeta potential in pool filtration refers to:
Answer: The electrical charge on suspended particles affecting their ability to be filtered
Zeta potential is the electrical charge on suspended particles; coagulants neutralize this charge to help particles clump together and be more easily filtered.
What is the correct procedure when vacuuming a pool with heavy algae through a sand filter?
Answer: Vacuum to waste to prevent algae from passing through and recontaminating the pool
When vacuuming heavy algae, vacuum to waste so dead algae particles are sent directly to drain and cannot pass through the filter back into the pool.
Which of the following is a sign that a sand filter's laterals may be broken?
Answer: Sand appearing in the pool after backwashing
Broken laterals allow filter sand to bypass into the pool return lines, causing sand to appear on the pool floor after pump operation.
What is the recommended cleaning method for a cartridge filter element?
Answer: Soak in a cartridge filter cleaner solution, then rinse with a low-pressure hose
Cartridge elements should be soaked in a filter cleaner or dilute acid solution to dissolve oils and scale, then rinsed with a low-pressure hose from top to bottom.
In a variable-speed pump (VSP) system, what is the primary energy-saving strategy?
Answer: Reducing pump speed during off-peak hours to lower flow while maintaining turnover
VSPs save energy by running at lower speeds during off-peak periods; pump power consumption drops with the cube of speed, so small speed reductions yield large energy savings.
What is the purpose of a sight glass on a filter system?
Answer: To visually inspect the clarity of backwash water to determine when backwashing is complete
A sight glass is installed on the backwash waste line so the operator can observe when the backwash water runs clear, indicating the cleaning cycle is complete.