ORP (Oxidation reduction potential) measures the oxidizing capacity in water. It is a proven measurement mandated for commercial pool sanitization now available for residential pools. Unlike most home test processes, ORP is not fooled by the effects of pH, TDS (Total dissolved solids) and other factors. Most home test kits and strips only report free chlorine and other less effective chlorines. Only ORP can deliver further detailed analysis of the more important free Chlorine. It differentiates free Chlorine’s components HOCL (Hypochlorous acid) and OCI- (Hypochlorite ion). OCI- is a slow-acting sanitizer and HOCL is up to 300 times more effective. ORP targets HOCL, a more fine tuned measurement of the effectiveness of Chlorine and water quality.
Exhaustive global studies have reported on the relationship between ORP and chlorine’s activity with germs and bacteria concluding that ORP is the only significant predictor of water bacterial quality. Subsequently, in most states, the highly regulated commercial pool industry requires ORP testing.
ORP is a measure of the cleanliness of the water and its ability to break down contaminants.
ORP sensors measure the dissolved oxygen. More contaminants in the water result in less dissolved oxygen and lower the ORP level. Not good! The higher the ORP level, the better the water can destroy contaminants. Great!