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The Filbur FC-3740 is the replacement filter for the Unicel C-4618 R.
Guaranteed to fit or your money back!
The Unicel C-4618 Comp. Coleco DR-18 Pool & Spa Filter is a replacement pool filter cartridge built with pleated media and 13 square feet of media area to improve pool/spa water quality. This compatible Unicel pool filter, also known as the Filbur FC-3740, measures 4 3/4" x 18" with a 2 3/8" Open bottom style and 1 1/8" Open top style.