Oxidation reduction potential (ORP) definition
Oxidation reduction potential (ORP) means the measurement of the oxidizing properties of any sanitizer being used in a public swimming pool, and is measured in millivolts (mV) by an ORP meter.
Oxidation reduction potential (ORP) means the measurement of the oxidizing properties of any sanitizer being used in a pool, spa, or other water feature, and is measured in millivolts (mV) by an ORP meter. Also known as "high resolution reduction" or "HRR".