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Thread: Water comes up other sink when disposal is on

  1. #1

    Default Water comes up other sink when disposal is on

    We have been battling this problem for years now. Both kitchen sink sides drain freely. But...if there is water in the disposal side and the disposal is turned on, there is bubbling and gurgling on the disposal side and water comes up into the other sink. Any ideas?

  2. #2
    Plumber jimbo's Avatar
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    It the drains are really ok, then to some extent this may just be the nature of your installation. The disposer acts as sort of a pump, and as it send the water out, that water will look for the path of least resistance, and will often split between going down the drain and going across to the other sink.

    If you could post a picture of the piping under the sink, this could be made clear.

  3. #3
    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by vlbridges View Post
    We have been battling this problem for years now. Both kitchen sink sides drain freely. But...if there is water in the disposal side and the disposal is turned on, there is bubbling and gurgling on the disposal side and water comes up into the other sink. Any ideas?
    Do a small test, fill up the side without the disposal. Fill it all the way up. Then let it drain and observe what happens on the disposal side. If it backs up into the other side while it is draining then there is a partial blockage.

    See most people just run the water in both sides and it will drain just fine, but when you fill a side up and let the water go, you are getting a flow rate greater than what the faucet can supply and it will help you diagnose the issue. Now if it does not back up when you drain that side of the sink. The problem is in how its piped under the sink. Then a picture will be a great help.

  4. #4

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    Quote Originally Posted by SewerRatz View Post
    Do a small test, fill up the side without the disposal. Fill it all the way up. Then let it drain and observe what happens on the disposal side. If it backs up into the other side while it is draining then there is a partial blockage.

    See most people just run the water in both sides and it will drain just fine, but when you fill a side up and let the water go, you are getting a flow rate greater than what the faucet can supply and it will help you diagnose the issue. Now if it does not back up when you drain that side of the sink. The problem is in how its piped under the sink. Then a picture will be a great help.
    Water comes to the top of the disposal side when a full sink is released from non-disposal side. No gurgling and bubbling. I'm including a photo of the plumbing, but I suspect our 34-year old pipes need a good goosing! :-)

    It appears I do not know how to include a photo. sorry.
    Last edited by vlbridges; 02-17-2009 at 11:32 AM. Reason: no photo

  5. #5

    Default Photo Included

    Here we go. By Golly, I think I've got it! :-)
    Attached Images Attached Images  

  6. #6
    Illinois Licensed Plumber SewerRatz's Avatar
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    Well yes you have a slow drain, a good power rodding will fix that, then second you need to repipe under your sink. that corrugated pipe needs to go, Also they make a disposal kit for end waste discharge that will get rid of the down turned pipe. Below are some pictures. The tee should have a baffle in it as well.



  7. #7
    Illinois Licensed Plumber SewerRatz's Avatar
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    If you are in Illinois you are not allowed to use a single trap for both sides of the the sink and are not allowed to discharge the dishwasher into the garbage disposal. If you are in Illinois let me know and I will post pics on how it should be installed to meet Illinois code.

  8. #8

    Default Not Illinois

    Thanks for the offer...we live in Tucson, AZ. My husband had a heck of a time installing our sink and disposal after our kitchen remodel. The new sink is larger than the old one and the drains did not match up with the existing plumbing. After several tries with various piping and connections, he was forced to use that stupid flex stuff, which he hates! From the photo, would you have a suggestion as to how we can eliminate the flex and use rigid?

    Thank you for your continued help and advice.

  9. #9
    Illinois Licensed Plumber SewerRatz's Avatar
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    Remove that long 1 1/2" galvanized nipple and install a shorter one so your quarter bend (the arm of the trap) can move forward.

  10. #10

    Default Shorten Pipe

    We knew you would say that. My husband has avoided that solution from day one. For the record, I have urged him to bring in a real plumber but he is a glutton for punishment...and loves doing things himself.

    I should mention that earlier this week we borrowed an electric snake from a friend and ran it from the beginning of the line outside the sink all the way to our septic tank...twice. It went through very easily the second pass. If we have a blockage it may be in that pesky pipe or between it and and where we started the snaking. Our next task will be to check that pipe and clear it if there is blockage. I will let you know how we fair. Thanks again.

  11. #11

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    I just discovered this thread, I am from Illinois and am looking at plumbing a double kitchen sink with disposal and dishwasher. Could you post a drawing with the way it should be plumbed.

  12. #12
    Forum Admin, Expert Plumber Terry's Avatar
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    Most plumbers would use a "disposer kit" which comes with the straight pipe and the baffle tee.

  13. #13
    DIY Senior Member TedL's Avatar
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    RLKEIME: You're going to want to wait for SeweRatz drawing for the "legal in Illinois" version.

  14. #14
    Illinois Licensed Plumber SewerRatz's Avatar
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    There is a couple of things Illinois wants done and not done. First they do not want you to discharge the dish washer into the disposal and the other thing is they want the disposal to have its own trap separate from the other side of the sink.

    Below is from the Illinois plumbing code book.

    Section 890.710 Food Waste Disposal Units

    a) Installation. Food waste disposal units shall be trapped separately from any other fixture or compartment, shall be connected directly to the sanitary drainage system, and shall be properly vented. Dishwashers shall not discharge into food waste disposal units. Units may have either automatic or hand-operated water supply control. (See Section 890.1130(a), (b) and (c).)

    b) Commercial-Type Grinders. Commercial-type food grinders shall be provided with a waste line at least 2 inches in diameter. (See Appendix F: Illustration D.)

    Section 890.770 Dishwashing Machines

    a) Domestic Dishwasher (Private Residence). When a domestic dishwashing machine drain line is connected to the house side of a trap from a sink, the drain from the dishwasher shall be carried up to the underside of the spill rim of the sink. Dishwashing machines shall discharge separately into a trap or tail piece of the kitchen sink and shall not connect to the food waste disposal unit.

    b) Water Supply Connection. The water supply to commercial dishwashing machines shall be connected through an air gap or by means of proper backflow protection, e.g., a non-pressure type (atmospheric) vacuum breaker or a dual check valve backflow preventer assembly (DuC), depending upon the circumstances.

    c) Commercial dishwashing machines shall indirectly discharge to a proper receptor connected to the drainage system or as permitted in Section 890.1010(a).

    d) Hot Water. A commercial dishwashing machine or similar dishwashing equipment that relies upon hot water for sanitizing dishes and utensils, rather than chemicals for sanitizing, shall provide rinse water at 180 degrees F., except for a single-tank, stationary-rack, single temperature dishwashing machine which shall provide a rinse water temperature of 165 degrees F., in accordance with Section 750.830(h) of the "Food Service Sanitation Code" (77 Ill. Adm. Code 750).

    Give me a minute to dig up a picture.

  15. #15
    Illinois Licensed Plumber SewerRatz's Avatar
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    Let me post this part of the code about trap venting. So the other pro's will not say that this picture is wrong. The part in red is what pertains to the use of two traps on one vent under the kitchen sink. The picture is also from the plumbing code book. I am trying to find a better pic or drawing.

    Section 890.1480 Types of Fixture Trap Vents

    a) Trap Vent. No trap vent shall be installed within two pipe diameters of the trap weir. (See Appendix K: Illustration N.)

    b) Common Vent. A common vent, installed vertically, may be used for two fixture traps when both traps connect with a vertical waste at the same level. (See Appendix K: Illustration O.)

    c) Vertical Wet Vent. A vertical wet vent may be used for two fixtures set on the same floor level, but connecting at different levels in the stack, provided the vertical drain is one (1) pipe diameter larger than the upper fixture drain and that both drains conform to Appendix A: Table I. (See Appendix K: Illustrations P and Q.)

    d) Mechanical Vents. Mechanical devices shall not be installed in lieu of vent piping.


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