Good Decisions Start With Good Samples
Water testing is only useful when the sample represents the pool. Collect it elbow-deep, away from return jets, skimmers, chemical feed points, and the busiest splash areas. Rinse the vessel with pool water first, fill it without touching the inside, and test promptly.
Record the location, time, water temperature, and bather load with every reading. A number without context is a snapshot; a consistent log reveals the direction your water is moving.
The Core Testing Sequence
Test free chlorine and combined chlorine first, then pH, total alkalinity, and the other parameters your facility requires. Chlorine readings can change quickly, while alkalinity and calcium hardness usually move more slowly. Follow the test-kit instructions exactly, including reagent order and sample volume.
- Free chlorine and pH: before opening and at the interval required by your health code.
- Combined chlorine: whenever chlorine performance or swimmer comfort changes.
- Alkalinity, calcium hardness, and stabilizer: on a scheduled weekly or monthly cadence.
Frequency Is a Risk Decision
Increase testing after storms, heavy attendance, chemical adjustments, equipment work, or a fecal incident. A quiet weekday may need fewer checks than a crowded holiday, but it never justifies skipping the opening test. Train the next operator to recognize the same triggers and document every corrective action.
When readings are outside your operating range, slow down. Verify the result with a fresh sample, inspect the feeder and circulation system, make one measured adjustment, and test again. Consistency protects both bathers and the facility.