We are in rural Tasmania and currently have an Ozzi Kleen septic system (conventional). We would love to move to something more low cost and sustainable. It's a little difficult to with all the council regulations. Wormfarm system would be great but that means spending up to $15K+. Compost toilets like wheelie bins are way low-cost but need to work out how to make them council approved. What systems have you implemented successfully with council approval (helpful if you are also in Tasmania) ?