The letter Kay, Hebei Province, fiberglass septic tank is a synthetic resin matrix, glass fiber or fabric to enhance the material specifically for excreta disposal of sewage and sewage pond. Solid organic matter used to store the continuous inflow from the sewer, until the role of anaerobic microorganisms to break down, to reach a certain emission standards, in order to reduce the pressure on the urban sewage treatment plants. 
 Fiberglass septic tank is a principle of sedimentation and anaerobic fermentation, removal of suspended organic matter in sewage treatment facilities, are the primary transitional living treatment tank. Sewage contains large amounts of waste, paper, protozoon solids concentration of suspended solids of 100 ~ 350mg / L, BOD5 concentration of organic matter between 100 ~ 400mg / L, suspended organic matter concentration of BOD5 was 50 ~ 200mg / L. Sewage into the septic tank can be removed after 12 ~ 24h precipitation 50 percent to 60 percent of suspended solids. Sludge settling down after more than three months of the anaerobic digestion of organic matter in the sludge decomposition into stable inorganic perishable raw sludge into a stable cooked sludge, and change the structure of the sludge, reducing moisture content of the sludge. On a regular basis to the sludge to Qingtao Sinotrans, landfill or used as a fertilizer.