The Unicel C-4600 R is a compatible replacement for the following pool and spa filter cartridges:
The Unicel C-4600 Comp. Muskin A2300 Pool & Spa Filter is constructed with 10 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-3850, measures 4 5/8" in diameter and 8" in length with a Closed Knob Handle top style and 2 3/8" Open bottom style. This compatible Unicel pool filter also features antimicrobial end caps and wider support bands.