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  1. #1

    4040 RO setup design

    Hi, looking at building my own RO setup using a 4040 membrane.
    My current TDS is around 375-425 and is very hard (Bristol). Planning on installing a water softener prior to the membrane to help with the membranes life. Plus a large carbon dechlorinator will be installed prior to this, both of which I already have. Can somebody with more experience of RO systems let me know if I'm on the right track?

    I'm presuming the valve can be used to manually adjust the waste to product ratio in place of a fixed restrictor. The solenoid valve will be controlled via a timer to open for a minute or so ever hour to auto flush the membrane.

    Both RO outlet and dechlorinated outlets will be mixed to get my desired TDS and waste to RO water output, instead of using a fixed flow restrictor.
    4040 RO setup.jpg



  2. #2
    Quote Originally Posted by Stickleback View Post
    Hi, looking at building my own RO setup using a 4040 membrane.
    My current TDS is around 375-425 and is very hard (Bristol). Planning on installing a water softener prior to the membrane to help with the membranes life. Plus a large carbon dechlorinator will be installed prior to this, both of which I already have. Can somebody with more experience of RO systems let me know if I'm on the right track?

    I'm presuming the valve can be used to manually adjust the waste to product ratio in place of a fixed restrictor. The solenoid valve will be controlled via a timer to open for a minute or so ever hour to auto flush the membrane.

    Both RO outlet and dechlorinated outlets will be mixed to get my desired TDS and waste to RO water output, instead of using a fixed flow restrictor.
    4040 RO setup.jpg
    All looks good to me. Only thing I do different is to have the 5micron sediment filter after the carbon filter.

  3. Thanks freddyboy Thanked / Liked this Post
  4. #3
    Thanks for the reply Keith.

    Whats the reason for running the sediment filter after the carbon?

  5. #4
    Quote Originally Posted by Stickleback View Post
    Thanks for the reply Keith.

    Whats the reason for running the sediment filter after the carbon?
    Having the sediment filter after the carbon stops any carbon residue getting to the RO membranes. Also you don’t need to worry too much about flushing through the carbon filter after a carbon change.

  6. #5
    Quote Originally Posted by keithatrax View Post
    Having the sediment filter after the carbon stops any carbon residue getting to the RO membranes. Also you don’t need to worry too much about flushing through the carbon filter after a carbon change.
    Makes perfect sense

  7. #6
    Moderator Rank = Grand Champion Feline's Avatar
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    I am running a 4040 on my pond currently- output is good with no booster pump.

    Works great- the only disadvantage is the cost of metered tap water in my case.

    If you want to get your valve setup optimally it'd very useful to buy a couple of inline TDS meters for before your membrane and on the RO output. You can then gradually close the valve until you reach your target output TDS. It's also really nice to have flow meters on the output and waste so you know how much you're actually getting. When your membrane gets old you will notice you're getting less and less flow for any value of TDS so you know when you need to replace it.

    When I get round to it in the new year and I am going to experiment with pond water RO recycling- taking water from the clean side of my drum and pumping through the membrane. I would then top up the pond either with tap water through the dechlorinator, or possibly get a second 4040 for new incoming water. I will start a thread when I do it incase anyone on here is interested. The goal of the pond recycling is 2 fold- to reduce water wastage and also reduce pond nitrate levels.

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  9. #7
    Quote Originally Posted by Feline View Post
    I am running a 4040 on my pond currently- output is good with no booster pump.

    Works great- the only disadvantage is the cost of metered tap water in my case.

    If you want to get your valve setup optimally it'd very useful to buy a couple of inline TDS meters for before your membrane and on the RO output. You can then gradually close the valve until you reach your target output TDS. It's also really nice to have flow meters on the output and waste so you know how much you're actually getting. When your membrane gets old you will notice you're getting less and less flow for any value of TDS so you know when you need to replace it.

    When I get round to it in the new year and I am going to experiment with pond water RO recycling- taking water from the clean side of my drum and pumping through the membrane. I would then top up the pond either with tap water through the dechlorinator, or possibly get a second 4040 for new incoming water. I will start a thread when I do it incase anyone on here is interested. The goal of the pond recycling is 2 fold- to reduce water wastage and also reduce pond nitrate levels.
    Hi ,looking forward to see how you get on with the pond recycling as need to give it some thoughts for next winter project,
    my pond is silmar size to yours and being on a water meter is bad news for ro,would great to see some pictures of your recycling set up when you have it and running.
    cheers jay

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  11. #8
    Jay I will take a few photos of my 40/40 recycling set up over the weekend.

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  13. #9
    Quote Originally Posted by keithatrax View Post
    Jay I will take a few photos of my 40/40 recycling set up over the weekend.
    Cheers Keith that would help me out.

  14. #10
    Moderator Rank = Grand Champion Feline's Avatar
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    I am planning to copy Andy Finch’s setup- he made a nice video of his setup
    https://vimeo.com/38305859

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  16. #11
    Quote Originally Posted by Feline View Post
    I am planning to copy Andy Finch’s setup- he made a nice video of his setup
    https://vimeo.com/38305859
    Thanks for that video clip.

 

 

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