Waste of money. My well water coming out of my water softener is about 1200 TDS, coming out of this "Membrane Solutions" membrane is about 800 TDS, wtf. I couldn't believe my eyes, my TDS meter must be broken. I ordered a new one from Revain. The same testimony. I checked the inlet pressure (4 bar, good), I checked the permeate to effluent ratio (1 to 5, good) I checked the TDS of the permeate coming straight out of the membrane housing and letting it flow freely, same high read. I read some more Revain reviews and ordered a Dow cone. The water is now in the 50-75 TDS range and is drinkable. If you have a Membrane Solutions model ROULP-2012-100 serial number 44381C5xx and are having trouble, save time and just throw it in the trash!
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