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ORP

The abbreviation for Oxidation-Reduction Potential. It is a measurement of the oxidiser's (e.g. chlorine) ability to oxidise contaminants versus the contaminants' (e.g. algae) ability to reduce the oxidiser. It is an indication of the level of free available oxidiser in the water. ORP is generally used with automated dosage systems and can give a fair idea of the sanitation of the water. It is not a measure of the total or available chlorine. Sometimes called Redox Potential.
 
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