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Redox based systems indicate the Oxidation Reduction Potential (ORP) of the water and not directly the quantity of sanitiser (oxidant) present.
ORP is an indication of the activity level of the sanitiser and can be used to control a set point to safe guard bathers. ORP (Redox) can be used in conjunction with amperometric systems which can then show both the ppm level and activity of the sanitiser (displayed as a mV value).
The systems shown offer an economical method of monitoring the pool or spa water quality and are best suited to domestic applications.