One, light texture filaments performance. High strength, good elasticity, wear resistance, corrosion resistance, non-absorbent. As water treatment material. (1) has a sufficient chemical stability, treatment process, no harmful ingredients dissolution; (2) backwash air and water high strength friction, collision, breakage of the shear force is not running and the loss of material; (3) years immersion durable in water does not rot. Second, the air-water flushing system to make full use of the original ordinary rapid filter filtration space, guarantee a certain depth filtration, filter tow gas system is not abundant type with separate gas line, in the pool of the original DN400mm large resistance to water distribution mains a hole, directly into the pool DN150mm welding gas distribution mains, so that with the water distribution system and the trachea Road together two one-way system, both air and water wash alone, but also air and water shuffled. Three parameters used 20mm thick plate steel or plastic ABS board, opening rate of 10, aperture 10mm. According to the water mains filter is equipped with drainage grooves under the edge of the spatial depth, polypropylene fiber bundles net length to take 1.00 - 2.00m. Gas and water flushing intensity and flushing duration, with average particle filter to ordinary rapid filter. 4 Install steel cutting block after drilling, the bottom plate close to the bottom of the pool water distribution pipes above the horizontal welded into a single piece, the level of error is less than ± 5mm. And bottom plates, wall fixed firmly to prevent flushing loose float. Orifice with the surrounding wall cracks, after extrusion of wood plaster with cement mortar.