make sure when you buy a membrain you buy one that the rating is at 65psi. there were a lot of companies ripping people off a few years back by selling membrains by the 100psi rating, of which most people don't have 100 psi so you would buy a "75gpd" membrain and the most you would get out of it was 25 to 45 depending on water temp, as it was realy a 45/75 membrain. I know dow filmtec is one of the best ones out there and most others are just relabled filmtecs. dow used to lable there products TW30-1812-75/100 for example. the 75 would be the 65psi rating and the 100 would be the 90psi rating. from reading there site they have redesigned there membrains so the same filter is only labled as TW30-1812-75. when looking at the new specs it is impressive, the 75 is at 50 PSI now and instead of 120 being the max operating psi it is now 150psi. and at 100 PSI this filter now puts out 150gpd.
also remember temp real affects output. a water temp of 77 degrees gives you rated output but a water temp of 50 degrees will only give you about 48gpd instead of 75gpd.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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10-06-2009, 06:33 AM
. Measure the production level of your setup and see how far behind gpd you are.
Linear Mode
