The Unicel C-4307 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-4307 Comp. Pool Filter - General Foam 7 is a replacement pool filter cartridge with 7 sq. ft. of media area that traps contaminants in pool & spa water in its sharp pleat folds. This compatible Unicel pool filter, also known as the Filbur FC-3744, measures 4 3/4" x 8" with a 1 3/4" Cross Castle Open top style and 1 3/4" Male Slip bottom style.