Re: Biochar production is a system and staged process RE: [Biochar] Farmer who built a Kon-Tiki that was tractor mounted and fitted with spreader.
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ROI really depends on what products you make. In Australia the best returns are from selling to horse owners see various web sites on companies selling feedchar in Australia). Every business will need to work out markets costs and returns.
Of course we will give an instruction manual that has lots of tips about formulations.