Whole House Water Filter Sediment & Carbon Block with High Flow 2.5" x 20" Cartridges Included 20" Clear Filter Housings with 3/4" Brass Ports, Mounting Brackets and Filters 1st Stage: 20 Micron Sediment Filter. For particles such as sand, dirt, silt, and rust. To remove these particles it allows a better performance for the following Carbon Block filter. 2nd Stage: 5 Micron Carbon Block Filter. Removes chlorine, bad taste and odor, organic solvents and organic chemicals that contribute to bad taste and odor.