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Thread: RO Membrane Direction

  1. 02-06-2019, 11:12 PM #1
    plabarr
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    Default RO Membrane Direction

    I'm new to ROs and I have a unit that takes a 4x40 membrane. I got a Dow XLE-4040 membrane and it has a gasket/O-ring on one end but not the other. Could someone tell me which way that o-ring is supposed to face? Feed side or permeate/concentrate side, or maybe it doesn't matter. Thanks for the help!
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  2. 02-07-2019, 06:25 AM #2
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    bowhunter
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    The o-ring is the brine seal and is supposed to face the feed side. If it's installed the other way it may not seal properly.
    Leader 1/2 pint - Kawasaki Mule - Smoky Lake Filter Bottler
    24 GPH RO, 2 1/2 x 40 NF3 (NF270), 140 GPH (Brass with no relief valve ) ProCon pump
    2013 - 44 taps - 16 gallons syrup, 2014 - 109 taps - 26 gallons syrup
    2015 - 71 taps - 13.5 gallons syrup, 2016 - 125 taps - 24.25 gallons syrup
    2017 - 129 taps - 17.5 gallons syrup, 2018 - 128 taps- 18 gallons syrup
    2019 -130 taps - 18.5 gallons syrup, 2020 ~125 taps-19.75 gallons syrup
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  3. 02-07-2019, 09:27 PM #3
    plabarr
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    Thank you.
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