WP.5BB97P Compatible String-Wound Polypropylene Filter Cartridge, 10" x 4.5", 0.5 Micron 4 Pack by CFS Reduces sand, silt, scale, and rust particles in residential and municipal drinking water and industrial fluid applications 4 Pack of Nominal filtration rating of 0.5 micron Polypropylene cord precisely wound on a rigid polypropylene core for high dirt-loading capacity 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. **Please note this is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only.