The manure in the pond starts to ferment and synthesize with different proportions. The manure liquid can be naturally divided into three layers, 1%, and intestinal diseases are reduced. Using the fertilizer after fermentation in the toilet can reach the standard of insecticide and sterilization, and the harmlessness of manure, nitrogen content, and increase the soil Fertility prevents soil compaction. Today I will talk about the working principle of the double-urn septic tank. The double urn septic tank is a kind of disposal equipment that uses the principles of sedimentation and anaerobic fermentation to remove suspended organic matter in domestic sewage. It is a primary transitional disposal structure. Installation and construction are very convenient.