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The Filbur FC-3741 is the replacement filter for the Unicel C-6617 R.
Guaranteed to fit or your money back!
The Unicel C-6617 Comp. Pool & Spa Water Filter is a replacement pool filter cartridge built with pleated media and 23 square feet of media area to improve pool/spa water quality. This compatible Unicel pool filter, also known as the Filbur FC-3741, measures 6 1/2" x 17" with a 3" Open top and bottom styles.