The materials used in producing filter screen net are stainless steel fiber net, sintered stainless steel felts, phosphorus copper nets and brass nets, etc.. Single or multi-layers filter plates are encapsulated in nickel plated copper, aluminum or stainless steel frame in different shapes, such as round, semi-circular, rectangular, oblong, crescent-shaped, etc., and as well gaskets in copper, aluminum or stainless steel.