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Thread: RO/DI Membrane

  1. #1
    Senior Member ALRHA's Avatar
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    RO/DI Membrane

    My RO/DI is working much slower than promised (rather than 35 GPD i get like 15 GPD) Exactly how is the membrane supposed to be in the chamber (perhaps i have it wrong). The notched end of the plastic on the side of the cover and the unnotched end by the output side? and what about the rubber seal? is it necesary? where exactly is it supposed to be? towards the cap? towards the output? just by the seal?
    please help, instructions say absolutely NOTHING!!
    Albert
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  2. #2
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    Maybe your water pressure is simply lower?? Good ol' NYC plumbing!!!

  3. #3
    Senior Member Flame*Angel's Avatar
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    Yeah, the rated GPD is never achieved. That's only if you have optimal conditions - water a certain temperature at a certain presure.
    Susan

  4. #4
    Senior Member ReefVan's Avatar
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    Apparently the cold reduces output substantially. Perhaps it's time to look at a booster pump unit...

    Van impdaddy
    It's not junk, it's un-assembled DIY!

  5. #5
    Senior Member ALRHA's Avatar
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    would there be a reason to get one with a higher output (75 GPD) or would it not make a difference? and what about how i put the membrane and the rubber piece in?
    Albert
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  6. #6
    Senior Member ALRHA's Avatar
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    oh, also waste to water is like 10:1 rather than the 4:1 they claim.
    Albert
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  7. #7
    Senior Member ALRHA's Avatar
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    ok, i just ordered all new cartridges, and a TDS meter. lets see now if this helps.
    Albert
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  8. #8
    Senior Member ReefVan's Avatar
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    Was this a used unit?

    Van impdaddy
    It's not junk, it's un-assembled DIY!

  9. #9
    Senior Member ALRHA's Avatar
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    yeah, used by me!
    Albert
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  10. #10
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    Getting one at a higher output won't make a difference. It's all about the pressure of the water pushing against the membranes. Also as far as I know with an RO unit, it's normal to have a 10:1 ratio. Are you sure your little flow regulator tube isn't blocked? I had a similar problem when I first bought my unit and was using the cartridges that came with it. It blocked up in a matter of weeks and I couldn't figure out what was wrong. A person named Stephane on RC that by coincidence is a good friend now and is the one that does the amazing DIY skimmers and reactors helped me out by inviting me to pop by his place with my unit and compare both our cartridges in both units. After I bought new ones, they have always worked for their approximate normal timespan ever since.In other words, I don't know for sure, but I think I got cheapy cartridges with the unit if that is possible. Are yours still the oigianl cartridges? Might do a lot of good to change them.

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