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NiceAt that pressure Im getting over 125 GPD out of a 75 GPD membrane and at 99.4% rejection rate to this day.
Well Said. I need to get a booster pump ASAP!No.
The mebrane industry had to come up with some standards so they could test on brand or size against another and chose 60 psi and 77 degrees F. They are not the optimum pressure or temperature, in fact far from it. It gives them a way to compare aDow filmtec to a GE to a Koch to an Applied etc. Its just a standard, not a must and higher pressure is better just as colder than 77 degrees treats better and gives you lower TDS.
Plumbing code calls for no more than 80 psi residential line pressure.
That said, RO membranes function better at higher pressures. Filmtec membranes for instance have a max pressure rating of 300 psi. But, not all components in any RODI system can handle pressure that high. The weakest link in terms of ability to handle pressure is typically the clear filter housings. Some clear housings are better than others in this regard (as rat man said).
This is one of the things we think about when we hear people say "all rodi systems are alike." Well, no, they really aren't!
Also - if you're going to add a booster pump, it's best to plumb it in AFTER the prefilter housings to avoid exposing them to the elevated pressure.
Russ
As much as you can give it, membranes love pressure and perform better at higher pressures.
I have been running my current Spectrapure system with a booster pump set at 95-100 psi for about 5.5 years now and it has never posed a problem. At that pressure Im getting over 125 GPD out of a 75 GPD membrane and at 99.4% rejection rate to this day.