Replacement Pentek RO-2550 Water Filter Cartridge Kit. Quantity: 2 Activated Carbon Block Filter, 2 Polypropylene Sediment Filter, 2 Inline Filter Cartridge Denali Pure Universal 10 inch filter for Pentek RO-2550 RO 50 GPD wReverse Osmosis System Universal 10-inch Activated Carbon Block Filter, Polypropylene Sediment Filter, Inline Filter Cartridge. Improves taste and clarity while retaining beneficial nutrients by reducing chlorine, fine sediment, odor, silt, rust.