I have been a use of the system since 2016. The system was installed in my septic tank when I decided to rent my house out during my job assignment abroad. I had three different tenant families lived in my house since 2016 without any issues. In March 2021 when I returned from overseas, I realized the system was not functioning due to expected mechanical failure after 4-5 years of operation. Then I shipped my aerostream back to the factory to get refurbished as I was instructed. The process was pretty quick and smooth. Make sure your system is functioning after 4-5 years of installation. If it is not, Aero-Stream will help you to refurbish your pump ASAP!