UCB can be folded backwashing filter is the most widely used at home and abroad, the condensate fine treatment pre filter core, the filter using imported high-precision absolute accuracy of polypropylene filter membranes made of interface are all made of hot melt welding forming, without any additives, adhesives and surfactant, to ensure the filter of high precision, high flux, high strength, low dissolution and low starting pressure difference, filter structure using 40 inch and 30 inch frame welding type, reduced the number of filter frame welding interface, increase the strength of the filter element, to reduce the risk of leakage. At the same time, the filter area of the filter core is further increased. It is easy to install by thread connection, with large filtering area, high contamination amount, low running resistance, reusability of backwash, reduction of pressure and large flow rate. It can effectively remove suspended impurities such as iron and copper oxide in condensate water, protect expensive resin from pollution, and extend the running cycle of fine treatment system. The filter elements with different precision can be used to start and run stage of condensate water treatment in power plant respectively.