Pleatco PFS1836 Cartridge/Grid Replacement for American, Hayward, Pac-Fab 7 Full and 1 Half/Universal Grid Set Pleatco Cartridge Filter replacement Cartridge/Grid American, Hayward, Pac-Fab (7 full + 1 half)/"Universal" grid set Unicel: FS-2003; FILBUR: FC-9530