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    timster48's Avatar
    timster48 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Apr 12, 2006, 02:49 PM
    Sink backs up only when disposal is on
    I have just moved into a condo built in 1974 that has a double kitchen sink with disposal. The water drains fine through both drains when running the water or draining a filled sink, but when I run the disposal, it backs up in the other sink. I have a dishwasher that is seldom used connected to the disposal.
    Each sink has it's own trap running to a stub into the wall and I assume connected to a Y behind the wall. There does not appear to be a clog as the sink drains well if not using the disposal.
    Could the pitch or backfill be wrong?
    Thanks for any help.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Apr 12, 2006, 04:52 PM
    Hi Tim,

    You have a partial clog in the lateral(horizontal)drain line in the wall. The disposal acts like a pump discharging with much pressure and volume the when you just drain the sink. To repair,remove the trap and send a snake on intov the wall. You'll hit a bend about 6" in but work and crank around it and put out about 5' more. Afterwards flush the line out with boiling water. Good luck, Tom
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