Water Testing and Analysis Questions and Answers Flashcards

What is the difference between a colorimetric test and a titrimetric test?

Answer: Colorimetric tests compare color intensity to a standard while titrimetric tests count drops to reach an endpoint

Colorimetric tests measure concentration by matching color intensity. Titrimetric tests count drops of reagent added until a color change endpoint is reached.

Why is it important to test pool water at multiple locations?

Answer: Different areas may have different chemistry due to circulation patterns and bather distribution

Water chemistry varies throughout the pool due to circulation dead spots, chemical injection points, and bather concentration in certain areas.

What is an electronic water quality controller and what parameters does it monitor?

Answer: An automated system that continuously monitors ORP, pH, temperature, and adjusts chemical feed

Electronic controllers use sensors to continuously monitor ORP, pH, and temperature, automatically adjusting chemical feeder pumps.

What is the significance of a cloudy or turbid reading on a turbidity meter?

Answer: Turbidity above 0.5 NTU indicates suspended particles that can harbor pathogens and reduce visibility

Elevated turbidity indicates suspended particles that can shield pathogens from chlorine and reduce underwater visibility for lifeguard surveillance.

How should pool water test reagents be stored to maintain accuracy?

Answer: In a cool dark location between 50 and 85 degrees Fahrenheit, tightly capped

Reagents must be stored at 50 to 85 degrees, away from direct sunlight, tightly capped, and replaced before expiration dates.

What is the chlorine demand test and when should a CPO perform it?

Answer: A test that determines how much chlorine the water will consume before a residual is established

A chlorine demand test measures how much chlorine the water will consume before a free residual appears. It is used for troubleshooting persistent chlorine loss.