The Pentair Sta-Rite PLM100 Replacement Filter Cartridge is the ideal choice for maintaining clean and clear pool water. Made of high-quality reinforced polyester pleated material, this cartridge offers a media area of 100 square feet for maximum filtration. Compatible with System:2 PLM100 filters, each cartridge measures 13 inches in diameter and 18-1/4 inches in length. Upgrade your filtration system with Pentair.