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Hi Ahana, I am afraid for solid manure and grass there is only one possibility to keep it simple - batch dry fermentation. That means no water mixing, but percolation of bacteria water. There are very simple systems for self construction, but the bigger the more complex they get in any system as you have to keep to the health and safety rules. In case you want more input also in regards to a ready made system in small scale just to produce gas for cooking, which we actually have developped and sell, please come back to me under m.koettner@ibbk-biogas.de. Kind regards Michael Köttner