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The Filbur FC-3743 is the replacement filter for the Unicel C-4309 R.
Guaranteed to fit or your money back!
The Unicel C-4309 Comp. General Foam 10 Spa Filter is a replacement pool filter cartridge built with pleated media and 10 square feet of media area to improve pool/spa water quality. This compatible Unicel pool filter, also known as the Filbur FC-3742, measures 4 1/4" x 8" with a 1 3/4" Cross Castle Open top style and 1 3/4" Male Slip bottom style.