RO membranes

[StirCrazy]

Originally Posted by reefermadness

Yes I'm talking of the dow filmtec membranes (the best IMO).

How ever I only know of the 50,75,100 and 150gpd membranes. Never head of the 100/160?

almost all of them are variably rated, one rating at 50 psi a few years.
back unsaviory vendors were using this to there advantage and not telling people, so they would sell the 75@60 as a 90/160 , as at 60 PSI it is a 90gpd and at 100 PSI it was 160 GPDand it was cheeper than buying the 100 which would give you a true 100@50psi. then they would blame the lower output on the temp of your water.

since the membrain is rated for up to 150 PSI this wasn't a problem as long as people knew what they had and that at 50 PSI they only had a 75 gal membrain. another company started relabling dow 75 and 100s as 100/160's at 50 and 90 psi, but it was a dow membrain just relabled. mine are dow 100's which I run at 120 PSI giving me a total output of more than 360 GPD when I measured it last. I ran them this way for 2 years and did a 5 min backflush after every use, but they have been dry since I moved now so I will have to buy new ones.

Steve