The Pentair Pentek DGD-5005-20 is a 4.5" x 20" poly sediment filter is made for the Pentair Pentek Big Blue Filter Housings and will fit into 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. These filters will reduce sediment particles as small as 5 microns without imparting taste, odor, or color to your water and are chemically and bacterially resistant due to their polypropylene construction.