I 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?
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.
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.
