Quality Control & Process Improvement Flashcards

When a pool operator uses the '5 Whys' technique after a water quality failure, what is the goal?

Answer: To trace the failure back to its true root cause by asking 'why' repeatedly

The '5 Whys' technique drills down through symptoms to uncover the true root cause so it can be permanently corrected.

A pool's cyanuric acid (CYA) level is measured at 120 ppm in an outdoor pool. What process improvement action is needed?

Answer: Partially drain and dilute the pool with fresh water

CYA above 100 ppm (MAHC guidance) reduces chlorine effectiveness; dilution with fresh water is the only way to reduce CYA levels.

What is the purpose of a 'pre-shift checklist' in aquatic quality management?

Answer: To verify all critical systems and chemical levels meet standards before opening

A pre-shift checklist ensures all safety-critical parameters are verified before bathers enter, preventing operation with out-of-range conditions.

An operator is reviewing monthly water quality logs and notices pH consistently drifts high within two hours of opening. What is the MOST likely root cause?

Answer: CO2 off-gassing and aeration from bather activity and water features

Aeration from water features and CO2 off-gassing drives pH upward, which is a predictable pattern that should be addressed with an acid feed system.

Which key performance indicator (KPI) would BEST measure the effectiveness of a pool's waterborne illness prevention program?

Answer: Percentage of tests where free chlorine and pH were within target range

The percentage of time water parameters are within target range directly measures how consistently the pool is maintained at safe, effective levels.

A newly hired pool operator keeps adding acid to lower pH but overshoots the target repeatedly. Which quality improvement intervention is MOST appropriate?

Answer: Provide targeted training on acid dosing calculations and incremental adjustment

Targeted training on dosing calculations addresses the root cause (knowledge gap) and is the most sustainable quality improvement.

What is the significance of tracking 'near-miss' incidents in an aquatic facility quality program?

Answer: Near-misses reveal system weaknesses before they result in actual injuries or illness

Near-miss tracking follows the Heinrich Triangle principle—addressing near-misses proactively prevents future serious incidents.