How To Fix A Garbage Disposal That's Backing Up Into Sink

Splash Guard

If you have food waste coming back up into your sink when your disposer is running, and you have verified that the drain is clear, you should suspect that the splash guard needs to be replaced. The splash guard is the rubber device that you see just inside the drain opening. The rubber fingers of the splash guard should be pliable enough to allow food waste to be pushed past them but stiff enough to close the opening and keep the food waste from coming back up into the sink. The rubber compound of the splash guard will deteriorate with use over time and become more brittle. If the splash guard is missing any pieces or is no longer flexible, it should be replaced