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The Filbur FC-3840 is the replacement filter for the Unicel C-6620 R.
Guaranteed to fit or your money back!
The Unicel C-6620 Comp. Pool & Spa Water Filter is constructed with 20 sq. ft. of premium media area and sharp pleat folds to capture contaminants in your swimming pool and spa water. This pool filter cartridge, also known as the Filbur FC-3840, measures 6 1/4" in diameter and 8" in length with 2 3/8" Open top and bottom styles. This compatible Unicel pool filter also features antimicrobial end caps and wider support bands.