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#1
06-27-2006, 10:10 PM
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At two years you might be getting close to needing to replace it. Then again maybe not. I think I got 3 years on my first membrane which is why I was so surprised at how finicky they can be after all.
Basically I wouldn't worry about replacing the RO membrane unless you get uncharacteristically high tds coming out. I.e., if you watch your tds then you'll know when it's time to replace it. I would get about 40-70 tds coming out which is still basically a tenfold reduction, so there was still function left, but still, obviously there's a problem if you get those kinds of numbers and not, say, 0 to 10. I replace my prefilters approx. every 3 months.
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! 
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#2
06-27-2006, 10:18 PM
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Maybe when I come back from vacation I'll try a little experiment with a sprinkler solenoid valve, and just run the RO/DI every night for about an hour, and see what that does to the tds surge.
The only thing is I like running my reservoir empty between fills, that way I know I have water that's no more than "X" days old. I.e., if you run all time at near about the same level of water in the tank, then it becomes a pool of water that isn't completely refreshed periodically, and I can see that things like bacteria and whatnot could gain a possible foothold... Sheesh - there is no end to the pros and cons of any idea, is there?? 
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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#3
06-27-2006, 10:28 PM
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When you do a water change, you could use the reservoire water, then you know it is being 100% replaced.
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