New Disposal Backing Up

March 27th, 2010 by admin Leave a reply »

I have a new garbage disposal. When it runs, water comes up in the other sink. I have looked at your websites and read your book, but have not found the answer.

Answer:

Installation could be an issue here. Ideally, the disposal and the other sink basin will have a separate trap that is connected with a “Y” into the drain line in the wall.

In some cases, a disposal will be installed with a “T” to the tail piece of the adjacent sink (see illustration). With this installation, water can be pushed up into the adjacent sink.  You can buy a special “T” for this connection to direct the water down, but it’s still a questionable installation.

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