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Thread: RO membrane moldy in fridge - salvageable?

  1. #1
    Join Date
    Feb 2020
    Location
    MA
    Posts
    16

    Default RO membrane moldy in fridge - salvageable?

    Built a homemade version of an RO, very similar to an RO Bucket last year. Flushed the membrane and stored in the refrigerator. Found some mold on the bottom when I pulled it out of the fridge this year. Has anyone had any luck cleaning one that this happened to, or should I just chalk it up as a learning experience and buy a new membrane?

    Thank you

  2. #2
    Join Date
    Dec 2002
    Location
    Rock Creek, NC
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    5,807

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    Not wanting an off flavor in the finished product is a good enough reason to replace the membrane.
    Russ

    "Red Roof Maples" Where the term "boiling soda" was first introduced to the maple world!

    1930 Ford Model AA Doodlebug tractor
    A couple of Honda 4 wheelers
    Four chainsaws and no chickens!

  3. #3
    Join Date
    Jan 2006
    Location
    Oneida NY
    Posts
    11,566

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    Get a new membrane. Then when the season ends do a full wash. First a cold permeate rinse, then a warm soap wash, a rinse, then an acid wash, followed by a long rinse. Then either store it in a preservative or use it every 4-6 weeks on water only and store again.
    Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
    Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
    Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
    After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.

  4. #4
    Join Date
    Feb 2020
    Location
    MA
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    16

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    Thank you. Was just a little blue spot on the bottom and I wasn't sure if an acid wash would save it or not. Bascomms has the wash, acid and preservative, but only in 1 gallon / 1 lb quantities. More than I really need for my little one and the cost of those was more than the cost of my replacement membrane. They just started selling CDL's little hobby RO though so maybe they'll get smaller quantities for the folks that buy that. Kinda seems silly to buy a 1lb of preservative when I just need 1 tsp and I'm assuming that as a chemical, it has a shelf life of some sort.

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