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how to Connect RO line to PEX?

Discussion in 'DIY (Do-It-Yourself) Projects' started by SynDen, Oct 24, 2018.

  1. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    So part of my big tank has a cooling system, which is 1/2" pex line connected to a faucet, does a big coil in the tank, and dumps into my drip system for the front yard. I want to connect my Ro waste line to this, so that it too will dump to the yard when I make fresh water.

    Problem is I cant seem to find a way to connect the 1/4" RO tube to the 1/2" Pex line. I have several reducing adapters but the issue is that PEX line is measured differently then a RO tube. 1/4" pex is quite a bit wider then ro tube and I have yet to find a fitting that will let me connect the 2 together.
    Any one ever try to attach their RO to a PEX line, and if so, how did you do it?
     
  2. JuanGutz

    JuanGutz Marlin M.A.S.C Club Member

    Don’t have a fix for you but just wondering is it going to drop into your front yard during the winter too? And if so are you not afraid of freezes backing up the line?
     
  3. Andrew_bram

    Andrew_bram Shark M.A.S.C Club Member

    I am not exactly sure of the set up but I connected my ro unit to pex using a shark bite.

    Sent from my SM-G965U using Tapatalk
     
  4. TheRealChrisBrown

    TheRealChrisBrown Barracuda Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. B.O.D. Member-at-Large

    Could you dip the end of the PEX in boiling water for a bit, then push it onto the fitting? then when it cools maybe it would contract enough to seal tightly? But I think I'm thinking it the PEX is smaller than the adapter...you might be saying the PEX is larger.
     
  5. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    In winter it will dump to my sink in the basement, which is where it dumps currently

    Ya I have several sharkbite adapters, plus many john guest push fittings as well, and I cant get any to fit both yet. If you get a chance, mind looking at the connection?

    That might work if the size different wasn't so much. But RO 1/4" will fit inside PEX 1/4". RO tubing is measured by outer diameter, and pex measured by inner diameter, so pex size is quite a bit larger
     
  6. whyamisofly

    whyamisofly Cuttle Fish M.A.S.C Club Member

    I used Sharkbite as well - will grab a picture when I get home.
     
  7. Balz3352

    Balz3352 Marlin M.A.S.C Club Member

    Pex to pvc to ro?
     
  8. Andrew_bram

    Andrew_bram Shark M.A.S.C Club Member

    1/2 thread to 1/2 pvc and then another thread adapter for whatever your connection is. [​IMG][​IMG]

    Sent from my SM-G965U using Tapatalk
     
    SkyShark and TheRealChrisBrown like this.
  9. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    ah good idea. didnt think of using the faucet adapter which would have standard threading. thanks
     
  10. Andrew_bram

    Andrew_bram Shark M.A.S.C Club Member

    Anytime

    Sent from my SM-G965U using Tapatalk
     
  11. whyamisofly

    whyamisofly Cuttle Fish M.A.S.C Club Member

    Mine is an inline T, with the 1/4 connection in the middle.
     
  12. larryl

    larryl Copepod

    Hi Angel -

    Can you explain how you have things set up to feed to your backyard drip system? I've been wanting to do that for a long time with my RO/DI waste line plus the water I change out of my freshwater tanks.


    Thanks!
    Larry
     
  13. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    Sure. Initial connection for the cooling system is just tee'd into the cold water line for the washing machine with 1/2" pex
    1540429783421.jpg
    The line for that coils around in sump and then is connected to a 1/2" poly line coming in from outside with a shark bite and pvc adapter. That line runs outside and is connected to the main line for the drip system. Outside it goes through a pressure regulator before attaching to the main sprinkler line. A few valves in place so I can change whether I want to water the front or the back.

    The RO line will tee in just before the poly connection to the outside. A few check valves will ensure it flows outside 1540429831891.jpg

    Sent from my Nexus 6 using MASC mobile app
     
    Last edited: Oct 24, 2018
  14. whyamisofly

    whyamisofly Cuttle Fish M.A.S.C Club Member

  15. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    Hmm that might work, but What size is the white tube? Looks like 1/4" pex instead of RO line
     
  16. whyamisofly

    whyamisofly Cuttle Fish M.A.S.C Club Member

    Oops, didn't realize it posted the picture sideways. The piece coming out the right is 1/4 RO tubing, the top and bottom are 1/2" CPVC.
     
  17. SynDen

    SynDen Shark Staff Member M.A.S.C Club Member M.A.S.C. B.O.D. M.A.S.C President M.A.S.C Webmaster

    kewl, thanks. will have to see if I can find that fitting
     
  18. whyamisofly

    whyamisofly Cuttle Fish M.A.S.C Club Member

    It was an off-the-shelf part at Home Depot
     
    SynDen likes this.

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