Hamburg Wasser, a water supply company, purifies Hamburg's wastewater and turns it into biogas! When combined with 20% external co-substrates, sewage sludge produces approximately 95,000 m3 of gas per day, which feeds into the public network. To increase the production of gas, the company takes advantage of the co-digestion of several elements, managing to produce 100 to 600 m3 of gas with only 1 m3 of input.