Producing approximately 1 kilogram of usable biogas typically requires roughly 20 to 25 kilograms of fresh cow dung, combined with an equal proportion of water to form a uniform slurry. Because raw cow dung has a high moisture content and contains a substantial proportion of non-degradable solids, large volumes of feedstock are processed continuously inside anaerobic digesters to generate steady daily volumes of combustible gas for domestic cooking or heating requirements.