WP.5BB97P Compatible String-Wound Polypropylene Filter Cartridge, 10" x 4.5", 0.5 Micron 2 Pack by CFS Reduces sand, silt, scale, and rust particles in residential and municipal drinking water and industrial fluid applications Nominal filtration rating of 0.5 micron Polypropylene cord precisely wound on a rigid polypropylene core for high dirt-loading capacity Initial pressure drop of 5 psi at a flow rate of 10 gpm Temperature range of 40 to 165 degrees F (4.4 to 74 degrees C)