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
How does a UV (ultraviolet) sanitization system improve pool water quality?
Answer: It destroys pathogens and breaks down chloramines by exposing water to UV radiation
UV systems pass water past high-intensity UV lamps that inactivate microorganisms and photochemically destroy chloramines, reducing eye and skin irritation.
What is the primary energy-efficiency advantage of a variable speed pump (VSP) over a single-speed pump?
Answer: VSPs can operate at lower speeds during off-peak hours, reducing electricity consumption dramatically
Because power consumption decreases with the cube of speed reduction, a VSP running at half speed uses roughly one-eighth of the energy of a single-speed pump.
A pool has persistent algae growth despite free chlorine testing at 2 ppm. What should the operator suspect and check?
Answer: Cyanuric acid (stabilizer) levels above 100 ppm, rendering chlorine ineffective
Excessively high cyanuric acid over-stabilizes chlorine and can reduce its biocidal effectiveness to near zero, even when free chlorine readings appear adequate — a condition sometimes called 'chlorine lock.'
What is the primary periodic maintenance task required for a salt chlorine generator (SWG) electrolytic cell?
Answer: Inspect the cell and remove calcium scale deposits from the plates using a mild acid wash
Calcium carbonate scale deposits form on the cell plates over time in hard water and must be periodically dissolved with a dilute acid rinse to maintain chlorine output.
What is the function of a surge tank (balance tank) in an overflow-style pool system?
Answer: To capture water displaced by bather load and return it to the circulation system
A surge tank collects overflow water displaced when swimmers enter the pool and returns it to the system, maintaining water level stability and preventing water loss.
What is the only effective method to reduce total dissolved solids (TDS) in a pool that has exceeded the recommended maximum?
Answer: Partially drain the pool and refill with fresh water to dilute the TDS
Filtration and chemical treatment cannot remove TDS — dilution through partial draining and refilling with fresh water is the only way to lower it.
What does 'breakpoint chlorination' mean in pool water treatment?
Answer: Adding enough chlorine (typically 10× the combined chlorine level) to destroy all chloramines and establish a free chlorine residual
Breakpoint chlorination is the shock dose required to oxidize all combined chlorine (chloramines); any chlorine added beyond that point exists as effective free chlorine.