Pool Water Chemistry

What Is Pool pH?

Pool pH measures how acidic or basic pool water is. It affects disinfectant performance and water balance.

Continuous pH scale from 0 to 14, acidic at the low end, neutral at 7 at approximately 25°C, basic at the high end. One unit is a tenfold change in hydrogen-ion activity.
Continuous pH scale from 0 to 14, acidic at the low end, neutral at 7 at approximately 25°C, basic at the high end. One unit is a tenfold change in hydrogen-ion activity.

Understanding the Concept

The pH scale is logarithmic: a change of one unit represents a tenfold change in hydrogen-ion activity. The scale below explains acidity, not a recommended operating range.

Common Misunderstanding

pH and total alkalinity are different measurements. Alkalinity describes resistance to pH change.

Related terms

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