In a clean water system, using ORP to measure the dissolved ozone status works well. In our experience, however, the strong oxidizing power of ozone in complex (even moderate turbidity) systems can result in ORP values far below expected and even negative (reducing) values. In general, monitoring ozone with ORP at the generator source works well but measuring wash water becomes unreliable. Ozone detection kits are available and work well at the limit of approved concentrations for produce cooling and washing operations.

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