you might find that little tiny booster pump isn't good enough to push two 160gpd membrains. that rating is at 90 PSI, I beleive at 60 PSI they are only 90gpd each, unless you went with 3 membrains
at any rate, I moved into my last house and found my water psi was only 40 so I had to buy a 400 buck 3/4hp pump (I got it for 250 used) then I dialed the output of the pump to 100 PSI. but it has the capability to push the volume of water required at that pressure by the larger membrains where the small booster pumps can do the pressure but not the volume. so depending on what you house water pressure is you might need a new pump also.
Steve
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