I have a brs 75 gpd unit that I replaced the membrane with 100 gpd membrane and it isn't producing much product water. I changed the flow restrictor to 800 ml/min. I have 56 psi going into the membrane. All of the filters are new. I removed the shut off solenoid since I don't use it. Anybody have any ideas as to why it's only producing drips? It was producing faster with the 75 gpd membrane.
RODI producing very little product water
- Thread starter dnott3
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The only things that come to mind from when I did this are:
- Is the flow restrictor on correct or is it backwards. It's easy to mix up.
- Does the restrictor have a flush valve and is it closed?
If it isn't either of these, I would likely undo and redo all filters and the membrane. Something may not be seated correctly.
Hope this gives some ideas.
- Is the flow restrictor on correct or is it backwards. It's easy to mix up.
- Does the restrictor have a flush valve and is it closed?
If it isn't either of these, I would likely undo and redo all filters and the membrane. Something may not be seated correctly.
Hope this gives some ideas.
Definitely should not be making noise. Try opening the flush and see if anything changes. Otherwise it may be a bad restrictor.
Had a new restrictor sent to me and installed it. It is a 800 restrictor. It's still only producing drips of water. I just had it running for 2 hours and it only made about a cup of water. Any ideas?
EeyoreIsMySpiritAnimal
Just another girl who likes fish
Can you post a picture of the flow restrictor in the closed position? Sounds a lot like you've got it open...
EeyoreIsMySpiritAnimal
Just another girl who likes fish
Also, did you remove and reset the membrane, and are you sure it's not in backwards?
Membrane has been pulled out and reset a couple times.
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I was going to ask the same thing.
@dnott3 Can you post a photo of it in the not-working, closed position?
Malum Argenteum
Active Member
I run a 550ml restrictor (BRS, barrel type) on my 100gpd membrane. The 800ml did not allow high enough pressure for good production on my system. The 550ml has been working well (2 years since I installed it).
I ran it for 2 hours again with the 550. It did produce more water but not a significant amount, maybe 2 cups. But still significantly a lot less than when I was running the 75gpd membrane. Unfortunately I already threw out the old membrane or I would put it back in and see if it made a difference. I'm leaning towards just buying a new membrane and see if it makes a difference.
Malum Argenteum
Active Member
Another thing to maybe try before that is to change the prefilters (after 6 months of use, they're due for a replacement anyway, in my opinion). Not sure that will help, but needs to be done anyway and might just be the thing.
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