I've been lurking around permies for some time now and finally decided to pipe in.
I'm about to start building a house and smallholding on a piece of farmland/woodland in the north of Sweden. As has been pointed out elswhere in this forum, the greywater situation is one of the hardest parts to solve, with long winters and deep freezes.
My plan at the moment is as follows;
Outfall from the washhouse to pass through a basic grease and scraps filter (possibly vermiculture), then into half of a 1000 litre IBC, which will be filled with gravel and will drain into a complete IBC below ground. The connection between this gravel 'funnel' and the underground sump will be sealed, so when the sump is full, the funnel will fill up to overflow into a leachfield.
Ok, with me so far? Now the (hopefully) clever bit...
The other half of the cut-up IBC gets supported above this setup, a wind-powered pump draws water to it from the sump and a bell syphon empties it periodically into the 'funnel'. This top tank also gets filled with gravel and both half-tanks will be stocked with greenery to feed the chickens.
The whole setup will be inside a small polytunnel and the leachfield will begin in the ground inside to make more chicken food. On the downhill side of the tunnel, the rest of the leachfield will be planted with fuel wood trees to feed the RMH.
Enough rambling, what do you all think ?