We've been, over the years, slowly remodeling our 1926 farmhouse, built when there wasn't even electricity in the area. When we got around to the kitchen, we wanted all the conveniences, that included a dishwasher (other than one of us) and a garbage disposal unit. Being on a small flow sewage treatment facility, basically a house sized treatment plant, limited us to what we could install that wouldn't give the system "heartburn". This InSinkErator Evolution Septic Assist unit certainly fills the bill. The unit was easy enough to install and operates flawlessly. Incredibly quiet and fairly stingy with the tank of "bugs" that it injects when used. We've been using it now for about 6 months and haven't used half a bottle; it was a bit of a concern to us as to how much "consumable" it would use, but, we're quite happy with the unit and its function. Well done InSinkErator!