Double sink shooting water up thru drain when garbage disposal is on

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by gwheels16, Jan 11, 2011.

  1. gwheels16

    gwheels16 New Member

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    Jan 11, 2011
    Location:
    Arizona
    Hi, I have a kitchen sink that drains well threw both sinks when the water is on. However, if the water is running and the garbage disposal is on, water shoots up sometimes 2 feet in the air up thru the other sink drain.
    There seems to be no clog in either drain. They both drain when just the water is running. The sink does not have an air valve. Is this the problem? The only other thing that comes to mind is that maybe the drain pipes are not hooked up correctly. Maybe water that is still in the hiorizontal drain pipe from the disposal, shoots up out the other sink drain. Any suggestions on how to fix this?
     
  2. shacko

    shacko Master Plumber-Gas Fitter

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    [​IMG]

    This image shows ckose to how it should be hooked up, that tee in the drain is a baffel tee, thats what keeps one sink from draining into the other; if your hook up a lot different to that post a image and we will get back to you:)
     
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  4. gwheels16

    gwheels16 New Member

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    Jan 11, 2011
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    Arizona
    solution found thank you.

    Thanks for your help. It was a rental house, that had the sink re-installed after new granite countertops. I took the drain apart and found that they had installed the drain T with the baffle backwards| The baffle was pointing up towards the sink drain instead of down towards the trap. I re-insatalled the baffle correctly and had to redo some of the other piping but now it works like a charm. No more shooting water into the air. Fixed and works fine.
     
  5. AlishaO

    AlishaO New Member

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    May 26, 2016
    Location:
    California
    Hi, I have this same issue with the water shooting (up to 1+ foot in the air) from the second sink. Both sinks drain fine. A photo of how the disposal is hooked up is attached. Is it connected incorrectly? Thanks in advance for your help.
     

    Attached Files:

  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    New England
    Your install has lots of issues!
    1. You can't have the waste trying to go uphill to get to the drain...the connection the wall is too high for the outlet of the disposer.
    2. It's never a good idea to use that corrugated plastic downspout from the other sink...lots of places for crud to accumulate and smell really nasty after short order.
    3. Doesn't appear that the horizontal piece coming from the right-hand sink has a baffle in it. The combination of trying to push waste uphill to get to the drain and no baffle means it will take the path of least resistance...out the other sink. Eventually, a lot of it will drain, but leaving some waste backed up in the disposer, radically shortening its life.
     
  7. Reach4

    Reach4 Well-Known Member

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    Location:
    IL
    The disposal is the black thing on the left. Its output is via the black pipe going down.
     
  8. hj

    hj Moderator & Master Plumber Staff Member

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    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    AlishaO. That photo shows what happens when someone decides ANY ONE CAN BE A PLUMBER. The proper solution is to take it ALL apart and throw it away. Then start over and have a plumber do it correctly.
     
    rjbphd likes this.
  9. CountryBumkin

    CountryBumkin Active Member

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    Location:
    Orlando, FL
    It looks to me like you have too deep of a trap. I'm not a plumber so someone correct me if I'm wrong - but I think you need to do the trap along with the other recommendations. The "air gap" device shown is needed if you have a dishwasher connection to the disposer. If you don't have a dishwasher adding this AAV won't help.


    29792-8223ea54d4a7e984d6de317ae2765897.jpg
     
  10. hj

    hj Moderator & Master Plumber Staff Member

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    quote; The disposal is the black thing on the left.

    NOW, you tell me. actually, if someone did not know that, then they have absolutely no business working on, or advising about, plumbing. And, the "black think" unless it was made by GE or Hotpoint is a "disposER", not a "disposAL".
     
    Last edited: May 27, 2016
  11. Reach4

    Reach4 Well-Known Member

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    Sep 25, 2013
    Location:
    IL
    I agree. I don't think that alone would cause the symptoms.
    AlishaO, check the above posts for the word "baffle. As HJ said, this should be redone. Fortunately the wall connection is at a good height.



    [​IMG]
     
    Last edited: May 27, 2016
  12. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The disposer acts like a pump...having to push the waste up that far from the outlet of the trap means more problems. If it were just liquids, might not be as much of an issue, but the water will take the path of least resistance, and it's easier to push it out through the other sink than down then up again and out through the trap into the wall. A baffle will help, but may not solve the issue unless you reconfigure things. Ideally, you just want the trap outlet to turn the 90, then straight into the wall...it would be much easier if that inlet were lower for the amount of room you have. With all of those extra tubular connections, if things get knocked, things might start leaking underneath as well.
     
  13. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    To me, the tee you have looks like the kind that installs on the horizontal with a baffle in the middle.
    You have it installed vertical, which will push water toward the other bowl. Remove the tee and replace with the proper baffle tee meant for vertical installation.
    And it would be nice to do something with the p-trap you have too.

    What you have
    http://www.oatey.com/products/brass...outlet-waste/center-outlet-waste-w-baffle-tee

    What you need
    http://www.oatey.com/products/brass...plastic-outlet-waste/plastic-end-outlet-waste
     
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