Septic tank is the sewage through the pipeline to the special tank, so that the sewage through anaerobic fermentation biochemical treatment, finally achieve three state separation, the pollution-free waste liquid discharged into the municipal pipe network, solid waste interception tank, regular sedimentation tank. Septic tank is an indispensable supporting facility for human life, almost every building needs to have a corresponding septic tank facility. HMPP septic tank is a product made of HMPP twin-wound pipe with advanced market technology as the main body, cut, assembled and welded with material separator, head and other parts. Its strong pressure resistance, good pollution resistance, good sealing, easy maintenance, long life and other characteristics are more and more recognized and used by the market. HMPP septic tank of high modulus polypropylene material physical properties and good corrosion resistance and long life, can reach more than 50 years; The inner wall is smooth, good stain resistance, not easy to scale; High compressive strength, according to the requirements of construction, its above can drive; Extrusion welding, solid and reliable welding seam, zero leakage; Factory prefabrication, fast site construction, less excavation, small footprint, only 60% of the floor area for brick; The manhole is equipped with safety anti-ｄｒｏｐ cover with lock device, which is safer; Effective volume according to the market FRP septic tank division, easy to design and selection.