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Originally Posted by Doug
No I never. No idea I had to. Just reading the link from BRS. What does that do when replaced and not replaced?
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The flow restrictor is matched to the membrane to provide the best waste to good ratio along with the lowest TDS for the particular membrane. That will explain why you're producing as much waste with the new membrane as with the original 100 gpd, but only making half the amount of good water. It's kind of like your system is on a permanent 90% flush, with much of the water bypassing along the outside of the membrane. It's also likely why you're experiencing a higher TDS at the moment. Should be an inexpensive fix, restrictors are not that costly. I believe there are even adjustable restrictors available these days.
Mark... I thought the 75 gpd was one of the most efficient membranes?? Is the 150 two 75's in series?