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The Unicel C-8420 R replaces the following pool water filters:
The Unicel C-8420 Comp. Pool Water Filter Cartridge is a compatible replacement pool filter cartridge constructed with 150 square feet of pleated media area to trap contaminants in swimming pool and spa water. This compatible Unicel spa filter, also known as the Filbur FC-1211, has 4" Open top and bottom holes, and measures 8 15/16" x 28 3/16".