I know some people think they never need emptying but that's just a myth. Confirmed that with my local council enforcement officer.
YAWN
The Victorians may not have known much - b ut they knew enuff to keep sewaGE SWEET -
I don't understand what you mean, are you agreeing or disagreeing?
If there's a proven way to run a septic tank without emptying I'd love to know. It would also help if the council were happy with the method and if it didn't involve raw sewage leaking into the garden.
And Nick, there's plenty of stuff in human waste that I doubt can be turned into gas. There's plenty of metals for a start.