Great product, easy to install, powerful, quiet; this unit also uses a replaceable cartridge that injects a dose of liquid during use; the liquid helps break down food waste which is helpful to those with septic systems. I've found that this cartridge does not fit propertly into its seating, and regularly falls out during use, sometimes making a mess under the sink. I've wedged something under the cartridge so it can't fall out, but this is not an ideal solution. If INSINKERATOR fixed this problem, I would give the unit 5 stars...