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RO Membrane Question
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downhill_biker View Drop Down
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Joined: February 28 2009
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    Posted: July 05 2010 at 12:00am
I heard that you can use a larger membrane in a smaller RO unit. Is this true? I don't remember who told me this, but they said the membrane housings were all the same it was just the thickness of the membrane itself that determined how much flow it can do. I was hoping to take my 75gpd unit and change the membrane out to a 100gpd, or maybe a 150gpd. Is this possible?
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snoyce View Drop Down
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Points: 211 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snoyce Quote  Post ReplyReply Direct Link To This Post Posted: July 05 2010 at 8:32am
yes the housings are standard what you need is the correct flow restrictor for the membrane you are using.
 
 
So if you get a 100gpd membrane get the 100gpd flow restrictor.
 
The 75 gpd dow filmtec membrane is about the best on the market with the best rejection rate of something like 98%, the bigger membranes like 100, 150 I believe are only around 90% rejection rate, So you will use up your DI faster or get higher TDS water out of the higher membranes
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Mark Peterson View Drop Down
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Points: 21436 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark Peterson Quote  Post ReplyReply Direct Link To This Post Posted: July 05 2010 at 9:15am
I agree.
I have used 18, 24, 75 and 100 gph membranes in the same RO unit. I found a solution for having to acquire the correct flow restrictor, if it didn't come with the membrane. I use a simple inline valve that I adjust to get the maximum purified water output for each membrane.
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