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Old 03-08-2008, 11:31 AM   #1
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RO membrane worn out?

I noticed this morning that even though I'm not using any water from my RO/DI, that the RO waste line is putting out non-stop water to the drain.

I'm guessing this means the membrane is worn out or plugged? Obviously it's not putting enough clean water out to trigger the pressure switch that shuts of the input to it.

My system doesn't have a "flush" mechanism - can I just hook up a water source to one of the outputs for awhile to flush it, and try to get some more life out of the membrane?
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180G All-glass with dual megaflows in a custom stand
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250 pounds LR
160 pounds aragonite
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Old 03-08-2008, 11:44 AM   #2
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Check out this troubleshooting guide from the water filter store. They list multple causes and the cure for each.
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Old 03-08-2008, 10:01 PM   #3
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How long have you had this RO/DI unit? What is the TDS of your water before it gets to the RO? RO membranes should last a fairly long time. Keeping the prefilters changed will ensure the life of your RO membrane.
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Old 03-09-2008, 12:08 AM   #4
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A little over a year.

The TDS was around 350-400. After, less than 10, typically.
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180G build thread

180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI
Filstar XP3
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Old 03-09-2008, 12:31 AM   #5
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The membrane should be good for 2 - 3 years at a minimum. Your before and after tds is right on target.

Did the troubleshooting guide help?
If not, call filtersdirect and speak to them about it, or email them.
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Old 03-09-2008, 02:34 PM   #6
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Yeah...have you checked your TDS since the new issue? I'd be curious to know what is going on there...I've had my RO for 2.5 years now and it's doing great. I change the other filters every 9 months or so. I'm lucky I have very good water before it ever gets to the filters.
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Old 03-09-2008, 04:21 PM   #7
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My batteries are actually dead in my TDS meter - going to get new ones today.

I flushed the RO, put it all back together after replacing a couple of the cartidges, it seems much better now.

Thanks all!
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180G build thread

180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI
Filstar XP3
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