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ORP is a measurement of the oxidizing potential of water. ORP analyzers use an electrochemical sensor, and measure in millivolts.

Chlorine and other oxidizers can damage most RO (reverse osmosis) membranes, so if water treated with chlorine (e.g. tap water) is used as the feedwater for the RO unit, the chlorine must be removed prior to entering the membranes. Chlorine is removed either with activated carbon filters, or with a chemical dechlorinator, such as sodium bisulfite fed just prior to the membranes.

ORP meters are used at the membrane inlet to monitor and adjust the feed of the bisulfite, or to indicate that the carbon is becoming exhausted.

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What is the use of SMBS in RO Plant?

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