Water Testing and Analysis 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 Water Testing and Analysis Questions and Answers flashcards as text
What is the correct procedure for collecting a pool water sample for testing?
Answer: Collect from 12 to 18 inches below the surface, away from return inlets
Samples should be taken 12 to 18 inches below the surface, away from return inlets, skimmers, and chemical feeders.
What causes a DPD free chlorine test to show a clear result when chlorine has been added?
Answer: Chlorine bleaching from extremely high chlorine levels bleaches the DPD reagent
Very high chlorine levels above approximately 15 ppm can bleach the DPD indicator dye, giving a false zero reading.
What is the phenol red indicator used to measure in pool water testing?
Answer: pH level
Phenol red is a pH indicator that changes color from yellow (acidic) through orange to red (basic).
How should a pool operator verify the accuracy of their test kit?
Answer: Use a standard reference solution of known concentration
Test kit accuracy is verified using standard reference solutions with known, certified concentrations.
What does a cyanuric acid test measure and what method is commonly used?
Answer: Stabilizer concentration using a turbidity method with melamine reagent
The CYA test uses a turbidimetric method where melamine reagent creates cloudiness proportional to CYA concentration.
What is the purpose of a total alkalinity titration test?
Answer: It measures the water's buffering capacity by counting acid drops until a color change occurs
Total alkalinity is measured by titration: a pH indicator is added, then acid drops are counted until the color changes, indicating the alkalinity endpoint.