ECP5-20BB Compatible Pleated Cellulose Polyester Filter Cartridge, 20" x 4-1/2", 5 Microns 6 PACK Reduces sand, dirt, silt, rust, and scale particles in residential and commercial water Nominal filtration rating of 5 microns Cellulose media pleated around a polypropylene core for strength Initial pressure drop of less than 1.2 psi at a flow rate of 10 gpm Temperature range of 40 to 145 degrees F (4.4 to 62.8 degrees C) Any brand names or logos are the registered trademarks of their respective owners. Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility.