The Pentair Pentek DGD-7525-20 is a 20" dual grade poly sediment filter made of pure polypropylene and is rated to filter up to 25 microns. The Pentair DGD-7525-20 is built for Pentair's 20" Big Blue Filter Housings and will fit any 20" 'Big Blue' style filter housings. The Pentair Pentek DGD Series Sediment Filters feature high dirt-holding capacity compared to similar size sediment filters. This filter will reduce sediment particles as small as 25 microns without imparting taste, odor, or color to your water and is resistant to any types of Chemicals and Bacteria due to its polypropylene construction.