While attending the annual Wastewater show in Calgary, AB this spring, I was approached by a couple who had purchased a property near Millarville, AB. They had an Orenco AX-20 wastewater treatment plant for their wastewater. They had no idea how it worked, nor any maintenance expectations. They said that it hasn't been serviced for at least 2-3 years and wanted me to come and take a look and make sure everything was OK.
I was expecting a mess.... but I opened it up and couldn't believe how clean it was (comparatively).
Once again, when a system is designed and installed properly, and the homeowners don't abuse the system, these Orenco units are robust and keep themselves running. Maintenance is ALWAYS needed, however in this instance it shows the quality behind this product even after an extended maintenance interval.