Is it time for a new set of Grids for your bottom manifold DE Filter? You usually know it is time to replace your Pentair® Purex® DE Filter Grids when they are ripped, cracked, damaged, or even simply caked with debris to the point that cleaning just doesn't do the trick anymore. This complete kit comes with 8 full size Grids that are designed to directly replace your Pentair® Purex® bottom manifold DE Grids. These grids are manufactured with the highest quality materials for easy cleaning and long life. Only need to replace one? We also offer Single Replacement Bottom Manifold Grids! Bottom Manifold NOT Included in Kit, Pentair Purex Filter Bottom Manifold Sold Separately Vertical grids are constructed for use in Diatomaceous Earth (DE) filters and have a reinforced center core for added durability. The polystyrene frame is covered with mildew and rot resistant polypropylene cloth. The seams are stitched with chemical resistant heavy-duty string and sonic welded to prevent fraying. Note: Purex® 1000 Series Filters Require 6 Grids. Purex® 2000 Series Filters Require 8 Grids. Size (SQFT) Grid Length (Inches) Complete Kit Part # Single Grid Part # Filter Tank Part # 24 SQ' 12" L FC-9220-KIT 074922, FG-1224, FC-9220, SMBW 2024/1018 074922 36 SQ' 18" L FC-9230-KIT 074923, FG-1236, FC-9230, SMBW 2036/1027 074923 48 SQ' 24" L FC-9240-KIT 074924, FG-1248, FC-9240, SMBW 2048/1036 074924 60 SQ' 30" L FC-9250-KIT 074925, FG-1260, FC-9250, SMBW 2060/1045 074925