I have an aerobic and for breakage there is only the air pump. The area used is small, not fields, one in pipe and two out, air vent and waste water.
4 bathroom and 7 people.
The output is allowable for gardens.
I have 3 other non aerobic systems and they have only been in service since November, so I have no experience as yet.
This maybe off topic a bit but, I would recommend that you have a separate system for gray water. 5 of my 7 users are female and their hair causes more problems than any other single factor.
