Select your Hydronix 100% pure polypropylene sediment water filter below. Hydronix Sediment Depth Cartridges are made of 100% pure polypropylene and graded density for higher dirt holding capacity. These filters are coreless and come in "5, 10, 20, 30, 40, 10" Big Blue, and "20" Big Blue sizes. The Hydronix Sediment Depth Water Filter removes sediment, dirt, sand, and silt from your water supply.