Everpure EV953426 20-Inch Sediment Filter Prefilter cartridge for E-20 housings 10 micron sediment filter Filters out larger dirt, dust, and rust particles from water before it's transferred to the primary and post filters Tightly spun and features a durable slim bowl design for quick cartridge handling and replacement Includes clear housing, which allows for visual inspection of clogging and contaminants