After 10 years in our home we had our septic tank pumped out for the first time. At the same time our builders grade disposal began to leak and we did the research to find a replacement. I was intrigued by the Evolution Septic Assist and the claim that it could help the septic system. That claim cannot be properly verified until the next time we have the tank pumped out, but I figured a squirt of the liquid claimed to help break down food particles every time the unit is operated cannot hurt. The unit is a little larger than the one it replaced and is extremely quiet. The quality appears to be good with a much larger motor and a two stage cutting action. Installation was not difficult, although I had a professional plumber install the unit as I am less than handy when it comes to these things. Hope to get at least another 10 years of service from the Evolution Septic Assist unit and trust it will help in making the septic system work more efficiently.