: I have a double sink, one side has a garbage disposal. When I run a lot of water in either side, after a time, the water stops draining and the sinks fill on both side. if I run the discposal, all the water goes down at fist, and then when i trun the disposal off, the water comes back up in the sinks. (It is filling about 6 inches on both sides). If the water sits over night, it eventually drains. Any suggestions?