So this is an issue on this house that has been around since we bought the house and frankly I should have fixed it a long time ago but, here we are… one of those low items on the list as it only presents an issue every year or so and the duration it takes to resolve it is significantly less than a permanent fix.. At any rate, I made a video so that people can understand that if you add a garbage disposal, take care in understanding your drain elevations so you know to either expect this issue or, far preferably; avoid it.