The UHL series is used in a 6-inch diameter structure with a very high filtration area. The fluid is moved by the inward outflow, and the filter diameter is gradually smaller by the thickness of the gradient, the filter aperture is gradually smaller, and the different particle size particles are intercepted, which has the high level of the pollutant and the flow resistance, and ensures that all the impurities are interspersed in the filter core. The filter core is the same size as the pall brand flow filter. With good high temperature resistance and extensive chemical compatibility, the filter and filtration system can have high traffic, decrease size and investment province. The internal and external skeleton is used to enhance the polypropylene skeleton, improve the strength of the filter, prevent the deformation of the filter and facilitate the replacement of the filter. The internal filter is used in the use of the polypropylene material, the end and the filter layer are used in the fusion welding, the whole filter is not used in the process of the use of the filter, and the chemical compatibility can be applied in various fields.