Quote:
Originally Posted by reefermadness
I find the best flow restrictor to be a ball valve. With a PSI gauge on the input of the membrane you can adjust the ball valve so that the pressure on the membrane is to spec.
The 150gpd may have good rejection rate but needs 65psi to the membrane in order to acheive this. Most city homes will not have this kind of pressure and a booster would be needed. The 75gpd is the most popular membrane because it also has a high rejection rate that only needs 50psi to acheive which is great for most city homes and you would not need a booster to reach 50psi.
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Restricting the flow before the membrane is unlikely to correct a problem of mismatched membrane/flow restrictor downstream of the membrane. I could be mistaken, but I'm not sure a ball valve will lower the psi that the membrane sees either, all you do with that is restrict the volume of water available by making the opening in the line smaller, the same psi will still be present. If you're on city water and wish to adjust the water pressure, you may be better off locating the PRV (pressure reducing valve) in your home's plumbing. These are requred by code in most municipalities and I believe the default setting is 50 psi. They are adjustable though, and I've adjusted mine to provide around 80 psi.