Chemical Entity

Ozone

A powerful oxidizer generated on-site and injected into pool water as a supplemental sanitizer.

Definition

Ozone (O₃) is a powerful oxidizing agent generated on-site by UV lamps or corona discharge generators and injected into pool return water. It rapidly destroys organic compounds, chloramines, and pathogens. Because ozone dissipates quickly (it does not accumulate in pool water), it must always be used alongside a residual sanitizer — typically free chlorine at reduced levels. Ozone does not replace chlorine; it reduces the chlorine demand and helps maintain water clarity and quality with less total chemical use.

Quick Facts

Ideal Range
N/A (residual; used with 0.5–1 ppm FC)
Also Known As
O3, ozone, ozone generator, ozone sanitizer

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Glossary Terms