Waterloo Biofilter Systems Inc

We have had this system for about 7 years and have had various issues. As others have mentioned, we have experienced a sewage smell intermittently. We have recently had to have the entire system re-wired at a significant cost because the original design created points in the wiring that were prone to wear and eventually it shorted out. We were told when that work was done to expect to have to replace the pump sometime soon, as they typically only last about 7 years. This is all to say that there are a lot of moving parts in this system that are not part of a typical septic system, so be prepared for the cost of repairs in addition to the annual maintenance fees of about $300/year.
My biggest concern is the lack of local service available to support these systems when the fail. There are lots of contractors who are willing to install the system, but few that are willing to do the ongoing maintenance. This has meant that we have a service contract with a company that is hours away from us. So when something goes wrong, there isn't anyone available to come onsite immediately and I assume that the cost of that travel is incorporated into the fees we pay.
At the end of the day we feel like we have paid for a premium product that is somewhat lacking in design and the company has not sufficiently invested in the service infrastructure needed to support it.