For years, in several homes, I've removed the diverter piece of pipe, and replaced it with a straight piece without the diverter. Long time ago I discovered the diverter actually creates less pipe space for ground up stuff to exit the disposal unit. The function of the diverter is to potentially keep ground stuff from coming up into the other sink. However, I've never, repeat never, had a problem with food coming back into the other sink, even though I've removed the diverter.
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