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The Filbur FC-3745 is the replacement filter for the Unicel C-4601 R.
Guaranteed to fit or your money back!
The Unicel C-4601 Comp. Pool Water Filter Cartridge is a replacement pool filter cartridge with 16 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-3745, measures 4 3/4" x 18" with a 1 1/16" Open top style and 2 3/8" Open bottom style.