After installing it, it was so quiet that I went back and checked the wiring and ran a test carrot through the unit because I didnt believe the blades were turning. My only comment on the installation instructions is to emphasize the removal of the plug knockout for the dishwasher connection. It took a bit of doing to get it completely out and if I hadn't done one before, I could have missed that step. Nice to see a unit especially for septic systems.