Bert-slurry only AD (Anaerobic Digestion) plants apply the patented Power of Nature (PON) mixing technology, which is based on the principle of communicating vessels. The left schematic shows that the downforce created by the expanding biogas (B) volume in V2 pushes the digestate high up in V1. By releasing the biogas the downforce decreases, allowing the digestate to flow back into V2, thus restoring the balance (right schematic). This continuous process offers a considerable advantage when it comes to the operational costs and investment, and allows for to build small plants e.g. 30 kW. No other biogas system is using the power of nature as consequently as does Bert!