7) UNICEL FG-1003 D.E. Replacement Filter Full Grid 36 Sq Ft 7 Required FG1003 Replacement for: American, Hayward, Pac-Fab, Sta-Rite, Astral, Waterway, Jacuzzi 18" long 11" wide 36 sq. ft. Can Be Used as Replacement: Filbur FC-9330, Unicel FG-1003, Hayward Filter Grids, Astrial Grids, Jandy Grids, Pentair Grids, American Products Grids, Pac Fab Grids, Sta-Rite and Waterway Grids