These 2.5" x 20" Pleated Polyester cartridges have true multi-stage depth filtration integrated into their design.  Utilizing four (4) separate layers of micron filtration, outside-in flow allows the outer layers to trap larger-sized particles, resulting in much lower pressure drop compared to conventional filters.  Trapping various sized particles layer-by-layer, providing a much higher dirt holding capacity than standard spun polypropylene and string wound cartridges.  Ideal for Point-of-use (POU) and reverse osmosis applications.  These cartridges can be used in a wide range of applications such as residential, food service, commercial and industrial.