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I have a garage disposal installed in my kitchen double sink. The pipe that comes out of the garbage disposal is horizontal to the main vertical pipe before it goes to the p trap. The t joint is baffled, and I am not a fan of this arrangement since it clogs quite often. (once in 6 months)

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This causes a big problem for me since the dish waster is connected to the garbage disposal. How could I reconfigure this plumbing without the baffled t?

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A few things don't look right to me, the disposal usually has an elbow coming off it so the water drains down a bit before going to the p-trap. I doubt you have enough slope on that connection. The baffle is important, so don't remove that, but I'd lower it if possible. And the AAV is way too low, it should be near the countertop so that a clog in the drain doesn't result in water backing up under your counter. –  BMitch Aug 26 '13 at 13:27
    
@BMitch I have wondered about that vent cap quite a bit. I'll be sure to move it up more. If the baffle is important what can I do to to help prevent it from clogging? –  iamkrillin Aug 26 '13 at 13:33
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You need to get more slope on that horizontal run. Anything coming out of your disposal should be ground up small enough so it doesn't catch there, but you need enough slope so the water drains quickly. –  BMitch Aug 26 '13 at 13:37
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Then that is your main issue. It means that everytime you have a "items" in your disposal they have to be pushed out by a massive amount of water. Luckily the kitchen sink has a lot of water at once when it is used. But any clog will get exponentially worse very quick with this set up. I would aim about 6 inches further down than you are right now. –  DMoore Aug 26 '13 at 14:42
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The AAV should be above the overflow level of the sink, which in most kitchen sink installs would be above the rim of the sink. –  Tester101 Aug 26 '13 at 15:41
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2 Answers 2

When I am doing a disposal install (non professional but at least 10 for friends and family) I do a double 90 right away and slope drain down a bit from there.

After doing the double 90s you don't need that much slope but given you will potentially have food items I would maybe go 1/2" down overall on your straight into the T.

enter image description here

Also BMitch is right. The AAV I think by code is supposed to be on the surface but that is another question.

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Your horizontal pipe there looks like its not slopped, are you saying that I should do something similar to that or maybe put in a 45 so I can slop it down? –  iamkrillin Aug 26 '13 at 15:19
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It doesn't have to be sloped much if you go down right after garbage disposal but yes it still needs to be sloped. You don't have to go 45 degrees. If you do that is great and will get things down faster but the main thing is not letting the food backup into the disposal area. –  DMoore Aug 26 '13 at 15:20
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Two 45s would be better than two 90s. A sanitary tee would also be better than a straight tee, but I'm not sure they make sanitary tee tailpieces. –  Tester101 Aug 26 '13 at 15:52
    
@Tester101 - I agree but harder install and I am not sure it matters that much. –  DMoore Aug 26 '13 at 16:16
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I would replace that hare-brained baffle T fitting with a part like this: enter image description here

I could not find the right flavor online, but I have seen 1.5 inch white plastic with hand tightening connectors. Even a 45° Y would be better:
enter image description here

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From what I have found online about it the only purpose of the baffle is to keep water from backwashing into the other sink, I presume due to the pressure in which the water is ejected from the disposal. This seem to me like it would work much better –  iamkrillin Aug 26 '13 at 18:08
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