The Unicel C-6610 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-6610 Comp. Pool Filter Replacement increases water clarity and quality in swimming pools and spas. This pool filter cartridge features sharp pleat folds and 10 sq. ft. of media that traps contaminants effectively. This compatible Unicel pool filter, also known as the Filbur FC-3820, measures 6 1/4" x 8" with 2 3/8" Open top and bottom styles.