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The fiberglass septic tank is a treatment facility that uses the principles of sedimentation and anaerobic fermentation to remove suspended organic matter in domestic sewage. It is a primary transitional living treatment structure. Domestic sewage contains a large amount of feces, paper scraps, and pathogenic insects. The concentration of suspended solids is between ~/ and the concentration of organic matter is ~/, and the concentration of suspended organic matter is ~/. When sewage enters the septic tank and undergoes sedimentation, %~% of the suspended solids can be removed. After more than one month of anaerobic digestion of the settled sludge, the organic matter in the sludge is decomposed into stable inorganic matter, and the perishable raw sludge is converted into stable mature sludge, which changes the structure of the sludge and reduces the Moisture content of sludge. The sludge is regularly removed and transported to landfill or used as fertilizer