plumbing
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?
Have a look at the trap under your sink. Assuming it's PVC with large plastic nuts, all you should need is ChannelLock pliers:
Unscrew the trap from the wall and disposal, and clean the trap itself, or snake the drain going into the wall, depending on where your clog is. Be sure to have a bucket and towels handy since there will be water backed up before the clog and in the trap.
If you can't find the clog either in the trap or with the snake, and you know it's further down the drain (try running some water through the disposal and into the bucket with the trap out), then I have family that swear by these drain bladders that attach to a garden hose, get inserted into the drain (past the vent) and they swell up to seal your end of the pipe while sending water down until the clog is forced out:
Each one of these will cost around $20 give or take, well less than a visit from a plumber.
I would replace that hare-brained baffle T fitting with a 90° sweep tee fitting like this:
I could not find the right flavor online, but I have also seen 1.5 inch white plastic with hand tightening connectors.
Even a 45° wye would be better:
Best Answer
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.