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Thread: hodorskib's Small Scale RO Build

  1. #251
    Join Date
    Apr 2011
    Location
    Tomahawk, WI
    Posts
    29

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    So I was able to run sap through each individual housing today and sure enough, number 2 of 5 was passing sugar. It was showing 3 brix with all the 4 of the others at 0. I bypassed that one and ran the rest of my sap through the other 4. Tomorrow will be warm so I don't expect to get a run and I wanted to boil everything off today.

    Right now I have 90 gallons of permeate at 1 brix. When I run it through the 4 menbranes I get 2.5 brix so I'm running that back to my holding tank. Tomorrow I'll use it to figure out what's wrong with number 2.

    Thanks everyone for the great advice here. I'm feeling much more confident that this system can make a big difference.

  2. #252
    Join Date
    Feb 2017
    Location
    NY
    Posts
    21

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    Glad to hear you found a problem.

    I would put the membrane from #2 in a different housing and do a second test (to isolate a membrane or housing problem). After that, it should be pretty straight forward.

    Carl

  3. #253
    Join Date
    Apr 2011
    Location
    Tomahawk, WI
    Posts
    29

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    Quote Originally Posted by carls47807 View Post
    Glad to hear you found a problem.

    I would put the membrane from #2 in a different housing and do a second test (to isolate a membrane or housing problem). After that, it should be pretty straight forward.

    Carl
    Yes, I plan to swap the membranes in 1 and 2. That will tell me if it's the membrane or the housing. I have new ones ready to go.

    Thanks Carl

  4. #254
    Join Date
    Apr 2011
    Location
    Tomahawk, WI
    Posts
    29

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    So, I swapped the membranes between housing 1 and 2 and testing the permeate indicated a bad membrane.

    Pulled it from the housing and immediately noticed that the plastic wrap is slightly wrinkled at the seal. Not sure if that's the problem.
    20190408_154821.jpg
    Upon further inspection I found a crack in the wraps. I'm pretty sure that's a problem.
    20190408_154941.jpg
    It seems to be throughout the length of the membrane.
    20190408_155039.jpg
    I put in a new membrane and let it soak for a few minutes. Tested it and everything is working great.

    Thanks everyone for the great help. Some great knowledge here in Mapletrader.

  5. #255
    Join Date
    Feb 2017
    Location
    NY
    Posts
    21

    Default bad membrane

    It looks like it came delaminated from the permeate draw. Sap was probably flowing into the crack (circled in red), and running into the permeate discharge. badmembrane.jpg

    Glad you are up and running, and nice set up! Should save you a lot of time in the long run.

    Carl

  6. #256
    Join Date
    Apr 2011
    Location
    Tomahawk, WI
    Posts
    29

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    Quote Originally Posted by carls47807 View Post
    It looks like it came delaminated from the permeate draw. Sap was probably flowing into the crack (circled in red), and running into the permeate discharge. Attachment 19993
    That area you circled is actually just a shadow. I noticed the hole here.
    20190408_155039_LI.jpg
    That hole is straight through from the one on the other end.

    Thanks.

  7. #257
    Join Date
    Apr 2011
    Location
    Tomahawk, WI
    Posts
    29

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    I sure do love this system. Since I replaced that 1 membrane it's been running great. 2.9 going in, 0% coming out the permeate line and 7 going into my head tank. Awesome.

  8. #258
    Join Date
    Mar 2010
    Location
    Oakville, CT
    Posts
    251

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    Glad it all worked out!
    2' x 3' backyard evaporator with homemade steam hood
    34 gallons produced in 2018
    100 taps (90 on 3/16" tubing)
    Homemade RO added in 2012
    https://sites.google.com/view/mattat...aplesyrup/home

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