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enter image description hereI have a double sink with a disposal on the right side. The disposal joins the left sink drain via a slip joint baffle tee below the left sink then the drain goes to the P-trap and out. It was installed by a licensed plumber.

Every time the disposal is turned on water shoots up into the left sink which is where we like to keep a dish drainer. What can be done to stop the water from shooting up?

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    Your sink might be clogged. Also, consider adding photos of the underside of your sink. – MonkeyZeus Dec 20 '19 at 20:24
  • diy.stackexchange.com/q/90311/42053 could be relevant. – MonkeyZeus Dec 20 '19 at 20:25
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    Can you add a picture of what under the sink? – JACK Dec 20 '19 at 20:28
  • Do you have an "air gap" unit installed? – JRaef Dec 20 '19 at 20:35
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    You have a 90 degree tee, there are “swept” tees available that will promote the flow downwards... – Solar Mike Dec 20 '19 at 22:03
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My instincts are inline with the comments by MonkeyZues and Solar Mike. The impeller design of some disposals accelerates the discharge. A partially plugged trap will send water up, following the path of least resistance (and still let the sinks drain). If the discharge from the disposal swept down (with a swept tee) the discharge would be directed down instead of splashing into the vertical-side of the straight tee. Both ideas are simple and inexpensive - cleaning the trap and swapping the tee.

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  • Not sure that this is the answer, but it sounds likely to me and will take less than $5 and roughly 30 minutes to find out. – Greg Nickoloff Dec 21 '19 at 3:06
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Baffled Tee.

enter image description here

How to Install a Garbage Disposer - plumbingsupply.com

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  • Looks like this "baffled T" was designed for this issue. I didn't know they existed. Thanks Mazura! – Charles Jun 22 '20 at 18:46
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What about adding a dedicated p-trap for the garbage disposal, which would also cause the Tee to be slightly lower and further down from the sink, which might also help. I have seen installation where there are separate P-traps for both.

It might also help to lower the tee to make it further from the sink.

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