I have a in sink garbage disposal but rarely use it.
I just had to replace it because it burned out from a children's plastic spoon getting 'eaten' ... more than just seized there was smoke coming out of the unit.
So I have thought about just getting rid of it. But every house that I have lived in that has a dish washer also has had a in sink garbage disposal
I was wondering if they are needed \ recommended if you have dish washer?