Bought the Pro Line system two years ago and my drainfeild is as good as new. I have a two cell septic and lift tank that pumps to a 20 year old drainfield 200 feet away. Had a septic contractor run a camera into the drainfield prior to the lift tank pump running and it showed the drainfield to be in outstanding condition. This was the first Aero-Stream system that was installed in Onieda County Wisconsin. Based upon the number of failing systems in seasonal vacation homes in this area, Aero-Stream should sell many more.