To tell the truth, there isn't really much difference between a septic tank and greywater pit, except the greywater pit dispenses the water into the upper section of soil where the roots of the EDIBLE FRUIT SHRUBS can use the water and feed on the nutrients, and in the septic system the nitrogen drains out into the nearest water source.

"... once we go 'perm' I'd LOVE to tie my shower, and dish washer into this with the washing machine that would get all the water except the kitchen sink and toilet which is perfect."

Get hold of Art Ludwig's book The NEW Create an Oasis with Grey Water, and check out his ideas on a branched system, draining the different sources of greywater to different areas of your yard. Very clever!

Why not the water from the kitchen sink???

Sue