I'm still considering this:
http://www.ebuild.co.uk/topic/17564-vermifiltration-sewage-treatment-by-worms-does-it-work/
mainly as I can't find anything better. Where better means:
* non electric
* no noisy wind fans on soil stack vents
* minimal maintenance
I don't suppose since I did that post Nov 2015 anyone else has been brave (stupid?) enough to give vermifiltration ago?