Description of sewage filter foam 1) Application: The sewage filter foam is used as suspension biological filler which has very high efficent on various wastewater treatment engineerings. especially remove ammonia nitrogen in leatherworking process, remove COD in hard-degradation sewage, decoloration treatment in textile printing, deodorization treatment in various oganic exhaust gas, etc. 2) Appearance: we can cut the foam as customers' demand. Usually, we cut it to small ball, then put 6 balls into porous pellets. 3)Density: 1.05-1.20, the ballslightly heavier than water, so they can fully soak in water. 4)Technical features: opening more than 90% of the diameter of 10.5cm polypropylene spherical outer support body, built-in side length 1.8-2.2cm, bore 0-15cm, the thickness of 2-2.5cm of the regular hexagon mesh column polyurethane, resilience is more than 95%, more than 95% open porosity, surface area greater than 900m 2 / m3.