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Thread: Cleaning and storage of my RO Membranes

  1. #1
    Join Date
    Jan 2017
    Location
    WI
    Posts
    16

    Default Cleaning and storage of my RO Membranes

    Hello,

    Three years ago I built a small scale RO for my 70 tap operation using plans that came from this site. It has worked flawlessly! I started with three 150 psi membranes and added a fourth this year just to help speed it up a bit....also worked well. From year one to year two I rotated the membranes so #1 membrane went into the last place and the the #3 went into the first spot, etc. I have been very good about flushing the membranes every so often during the season using hydrogen peroxide solution as described in the build instructions...again from the instructions. I did the same procedure at the beginning of each year and also at the end of each year. Then I store the membranes in the refrigerator first wrapping the wet membranes in plastic wrap and then vacuum sealing them to keep them air tight for the year. I run my little ro at 130 psi and have a pressure gauge before the #1 membrane and another gauge after the #4 membrane. I have never had any issues with pressure dropping from the first gauge to the second gauge.

    So, all that said, when I looked at my membranes after this season I see that membrane #1 (three seasons under its belt) I notice that it looks pretty brown on both ends as you look at it from top and then bottom. Less discoloration on membranes #2 and #3 (also 3 seasons), and very little discoloration on the newest membrane #4 (one season of use).

    Should I be doing another type of year end cleaning to try to get my membranes cleaner? If so, what is that exact process and what materials do I need? And lastly, how many years of use can I expect from my membranes?

    Thanks much for any help!

    Jeff
    Blue Hills Sugar Bush
    Bruce, WI

  2. #2
    Join Date
    Jan 2006
    Location
    Oneida NY
    Posts
    10,454

    Default

    Ask the membrane manufacturer.
    Dave Klish about 1320 taps in '15, downsized after I lost my help, about 450-500 planned for 2021 (and after?)
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    http://s1041.photobucket.com/albums/...anssugarhouse/
    website: www.cnymaple.com

  3. #3
    Join Date
    Feb 2013
    Location
    Marysville, Ohio
    Posts
    662

    Default

    I don't know if anyone has ever done a soap or acid wash on these home RO membranes. My recollection is that people were just replacing the membranes once the performance deteriorated. I would probably buy one new membrane just in case and plan on replacing the worst looking one every year. Sounds like you should be able to get 3-5 years with no problem.
    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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