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The Filbur FC-3830 is the replacement filter for the Unicel C-6616 R.
Guaranteed to fit or your money back!
The Unicel C-6616 Comp. Pool & Spa Filter Cartridge is constructed with 16 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-3830, 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.