Residual oxidizer

Definition

Residual oxidizer is the remaining concentration of added oxidizers such as chlorine, bromine, or peroxide in the water.

It is tracked to confirm that an oxidative control program is delivering enough oxidizing pressure for bio-control. Residual testing is something ORP cannot substitute for in control programs. Monitoring residual helps predict corrosion risk when oxidizer levels change.

Related concepts

Biocidal dose · ORP · Critical monitoring parameters

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Part of The Blueprint of Water · 📏 measurement