Ultra－filtration is an advanced membrane separation technology in recent years. Membrane pore size is in 0. 01 0. 001 UM, can effectively remove water substances, such as the particles, colloids, bacteria, heat sources and organisms. This high- and new- technology is mainly employed in electronics, medicine, food and other industries in the pure water, high pure water preparation, for the purpose of separation, enrichment and purification;and in mineral water, pure water purification, aseptic production.