Originally Posted by
maple flats
Also, assuming the seals are correct, when you flush you want the flows roughly equal, for both concentrate and permeate, if you had the valve wide open (and you plumbed correctly) you pushed a huge majority thru the housing and out on the concentrate side, and very little thru the membrane on the permeate portion. To flush both should be the same flow, and during the process adjust the pressure as necessary to keep them equal. That's even if you are small and get .1 gpm on each or larger and get 4 gpm on each or any other flows, just equalize them using the needle valve to raise or lower the pressure.