Salt rejection = (1 − product conductivity / feed conductivity) × 100. A new TFC membrane provides 97–99.5% salt rejection. A decline in this value over time is a sign of membrane damage (chlorine, mechanical), an O-ring leak or fouling. The TDS of the product water is estimated by multiplying the average feed-concentrate TDS by the salt passage.
Technical glossary· Membrane technologies
Salt Rejection
Short definitionThe performance value showing what percentage of the dissolved salts in the feed water an RO membrane retains.
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