Unicel 8 FG-1004 D.E. Replacement Filter Full Grids 48 Sq Ft 7 Required FG1004 Replacement for: American, Hayward, Pac Fab, Sta Rite, Jandy, Astral, Waterway, Jacuzzi 24" long 11" wide 48 sq. ft. Can Be Used as Replacement: Unicel FG 1004, Hayward Filter Grids, Astrial Grids, Jandy Grids, Pentair Grids, American Products Grids, Pac Fab Grids, Sta Rite and Waterway Grids