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RO membrane poor rejection rate!


linbeg

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I bought spectrapure 90gpd refurbished RODi unit, i bought it around december 2013. But have not used the actual unit April 2014. I checked the TDS from just the RO water and found it to be at an 80% rejection rate. SO, i bought a new one and found that it literally just stayed at 80% rejection rate, althought the 90gdp standard RO membrane said that it would be at a 98% rejection rate. Anybody know why membrane isn't rejecting what it supposed to be doing?

Any help is much appreciated!!

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The first one probably dried out. They pretest their membranes so they are shipped wet, and you can't let them dry out. I assume that you got the replacement from them too. What's the waste water ratio? Have you let the unit run for awhile, or is this just the initial numbers?

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AZDesertRat

What are you testing with, how and where?

What is your tap water TDS, RO only TDS and your final RO/DI TDS?

What is your measured waste ratio?

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