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The Filbur FC-3735 is the replacement filter for the Unicel C-4616 R.
Guaranteed to fit or your money back!
The Unicel C-4616 Comp. Coleco DR-16 Spa Filter is a replacement pool filter cartridge built with pleated media and 12 square feet of media area to improve pool/spa water quality. This compatible Unicel pool filter, also known as the Filbur FC-3735, measures 4 3/4" x 16" with a 2 3/8" Open bottom style and 1 1/8" Open top style.