Recovering RO Reject is not ...

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Recovering RO Reject is not practical. The concentration factor for this type of waste is around 3-4x.  Imagine if the feed TDS is around 500 ppm, reject TDS will be around 1500-2000 ppm. Reducing it back to its feed water quality involves a technology that has high cost with high opex. Work instead in increasing permeate yield say about 75-80% range