Watts Premier 560088 5-Micron Sediment Replacement, 2-Pack Filters Extra-fine (5-micron) sediment filtration: dirt, sand, silt, rust and scale particles Fits Watts WH-LD Premier Whole House Filter System Also fits most other brands of Whole-House and under counter filters that accept 9.5 x 2.5-Inch filters Replace every 3 to 6 months Recommended for use with city and well water supplies