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The Unicel C-4603 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-4603 Comp. Haugh's C-11 Pool Filter increases water clarity and quality in swimming pools and spas. This pool filter cartridge features sharp pleat folds and 9 sq. ft. of media that traps contaminants effectively. This compatible Unicel pool filter, also known as the Filbur FC-3756, measures 4 1/4" x 10 7/8" with a 1 5/8" Open top style and 1 9/10" Open bottom style with Slots.