Pool Water Chemistry Questions and Answers Flashcards
6 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 6 Pool Water Chemistry Questions and Answers flashcards as text
What is the relationship between water temperature and chlorine consumption in a pool?
Answer: Higher temperatures increase chlorine consumption rate
Higher water temperatures accelerate chlorine degradation through faster chemical reactions and increased off-gassing.
What is the purpose of a phosphate test in pool water management?
Answer: To identify nutrient levels that promote algae growth
Phosphates are nutrients that feed algae growth. High phosphate levels increase chlorine demand even with adequate chlorine residual.
What is Total Dissolved Solids and at what level does it become problematic?
Answer: TDS above 1,500 ppm above fill water level indicates the need for partial draining
When TDS exceeds fill water levels by more than 1,500 ppm, water quality degrades and partial draining is the only effective remedy.
How does cyanuric acid affect the ORP reading of pool water?
Answer: CYA lowers ORP readings even when free chlorine levels appear adequate
Cyanuric acid binds with free chlorine, reducing its oxidation potential and lowering ORP readings.
What chemical reaction occurs when sodium bisulfate is added to pool water?
Answer: It dissociates to release hydrogen ions, lowering pH
Sodium bisulfate dissociates in water to release hydrogen ions, which lower pH. It also reduces total alkalinity.
What is the significance of a Langelier Saturation Index reading of exactly 0.0?
Answer: The water is in perfect calcium carbonate equilibrium
An LSI of 0.0 means the water is perfectly balanced with respect to calcium carbonate, neither depositing scale nor dissolving calcium from surfaces.