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Old 10-15-2007, 01:34 PM   #11
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FWIW, I use the DI water at work, and it is a bit of a pain to lug it home, but it was certainly cheaper than buying a home system (starving grad student). I use big plastic carboys about the size of a Poland Spring bottle, maybe a little bigger. One carboy = 1 water change. It does make that part easy!
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Old 10-15-2007, 02:35 PM   #12
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How long has it been since you used your RO unit?
Typical membrane life is 3-5 years with proper care.
I got my unit 3 years ago from airwaterice.com. My unit has a flush valve that lets me flush the membrane after I'm done, and before I start a RODI session. I only use my system every 3 weeks or so to make a new batch of top-off water, and water for a water change.

"Membranes need to be replaced when any of the following are true.
You notice Poor taste or water quality. You may have changed all of the other
filters and the water still tastes bad. Your membrane has degraded with age and
is not performing as well as it should. Typical membrane life is (3-5) years,
typical.
Excessive poor tasting water, the membrane has been compromised and water
is flowing freely through it. Most common cause is CHLORINE exposure. Poor
filter maintenance or poor quality carbon filters are usually to blame. Or, when
not much water is available, the system seems to have lost its pressure. The
membrane has become fouled and is not making enough water."
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Old 10-15-2007, 03:56 PM   #13
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I guess it's been 2 years or so since I've used it. So the membrane doesn't need to be kept damp? Or should I just toss out the first couple of gallons of water made after I start up again?
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Old 10-15-2007, 04:31 PM   #14
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I would toss the first 3 -5 gallons and then test the output. It might be fine.
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Old 10-15-2007, 11:25 PM   #15
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Cool, thanks!
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Old 10-17-2007, 07:45 PM   #16
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Quote:
Typical membrane life is 3-5 years with proper care.
True. W/ proper care.
RO membranes definitely need to be kept damp. When you first buy them they are coated in something and bagged to prevent damage. If you broke in the membrane and then allowed it to dry out, it will need to be replaced. If you never broke it in, it may still be good. You'll need a TDS meter to tell. That is why RO units that are not used very often, ie daily, should be stored w/ the input/output tubes up high so that water can't siphon out of the hoses, draining the RO membrane chamber, allowing the membrane to dry and ruin. It says this in the instructions for both my RO unit and the replacement membrane I bought for it. I'm positive
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Old 10-18-2007, 06:47 PM   #17
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With an adjustable flow regulator, you can adjust the water wasted but you want about 4:1. Water temp and pressure will make this vary without and adj. regulator.

Some membrane are more efficient but it should not make a difference on waster water. Most 75 gpd membrane have a 98% rejection rate. The 100 gpd units on ebay typically have a 90% rejection rate. This just makes the TDS higher after the RO and/or using up the DI resin faster.
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Old 10-19-2007, 01:17 PM   #18
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Thanks guys. By "break in" you mean acutually using the membrane right? I did do that, so I guess I need a new membrane. I'll order one from filterdirect in a bit.

I have the ebay unit, so I guess I have the 90% rejection rate. Anything is better than nothing though.

Thanks again.
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Old 10-20-2007, 09:09 AM   #19
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I have an Aquasafe unit. When I replaced my membrane I got a Filmtec 75 gpd to replace my 100 gpd. Gives me a better rejection rate and I really can't tell a big difference in output. You just need to replace the flow restrictor. I bought an adjustable one as mentioned above so I just dialed it in so I get a 4 to 1 waste. The restrictors are only a few dollars. The hard part for my was locating the old unit one
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Old 10-20-2007, 02:10 PM   #20
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Yeah, and I'm not that mechanically inclined either. lol. I will give it my best shot and come to you guys with any questions.
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