If your pH keeps drifting, start with a reliable test before adding anything. Here are five ways to check it.
Test strips. Dip the strip, wait the time shown on the package and match it to the color chart. Follow the instructions for your particular strips.
Liquid test kits. Use the sample size and reagent amount the kit calls for, then compare the result with its chart.
Digital pH meters. Keep the probe maintained and calibrate it with the correct buffer solutions. A digital screen or a higher price does not guarantee a better reading. Follow the sampling and storage instructions, too.
Automatic monitoring. A suitable controller can monitor pH and, when equipped for it, adjust dosing. Keep it maintained and verify its readings with an independent test.
Pool service. Your technician can check the pH with the other water readings and help work out why it is moving.
Before you add a chemical
Look at alkalinity as well as pH. Sodium bicarbonate is mainly used to raise total alkalinity; it is not interchangeable with every product used to raise pH. Follow your test kit, disinfectant label and equipment instructions. Never mix pool chemicals together.
The CDC’s home-pool testing guidance covers chlorine, pH and common test limitations. Our water-balance calculator shows how pH relates to scaling conditions, but it cannot tell you whether the water is sanitized.
Write down readings and adjustments. A short history is much more useful than trying to remember what you added last week. If the results keep changing or do not make sense, talk with Zion Pools.
Updated : Clarified pH-meter accuracy and the role of alkalinity treatments.
This is an older guide. Follow current equipment and product instructions, and call us for today’s service pricing.