The UMM series folding filter element combines the characteristics of deep filtering technology and filter material folding, with multi-layer tapered aperture filter material structure and graded cutoff to ensure that the filter core has high pollution capacity and filter area, low pressure drop and high flux. Excellent filtering ability of impurities, especially for high suspension particles, colloid substances and high viscosity liquid filtration. Wide chemical compatibility, can filter various acids, bases and solvents.