The Unicel C-4313 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-4313 Comp. Simple Set 3766 Pool Filter increases water clarity and quality in swimming pools and spas. This pool filter cartridge features sharp pleat folds and Reemay filter media to trap contaminants effectively. This compatible Unicel pool filter, also known as the Filbur FC-3750, measures 4 1/4" x 3 3/4" with 2 1/16" top & bottom styles.