Testing

Test strips are fast and convenient, but accuracy depends on technique. Proper use, storage, and result reading makes the difference between helpful data and misleading readings.

Liquid test kits are more accurate than test strips. The DPD method measures free chlorine directly; the OTO method measures total chlorine. Understanding the difference matters.

Digital testers offer lab-quality accuracy for frequent testers. Photometers read chemical concentrations; ORP probes measure sanitiser activity directly. Both require regular calibration.

Test frequency should match your pool type, usage, and season. Free chlorine and pH need the most frequent attention; hardness and CYA can be tested monthly.

Test numbers only help if you know what action they require. This guide explains how to read, prioritise, and act on pool water test results.

Inaccurate test results are more dangerous than no results — they lead to wrong chemical additions. These are the most common pool testing mistakes and how to avoid them.