bit of more info on the AD, anything biodegradable can be used. some feedstocks have better methane yields per tonne than other. material used should not be greater than 12mm in size, dry matter should be 12 -15% in content to allow for ease of passing through the AD system. All material should be pasteurised to kill of harmful bugs and therefore the digesate (fertilizer) is suitable for spreading on all types of land...even for food consumption.