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The Filbur FC-1630 is the replacement filter for the Martec 50 R.
Guaranteed to fit or your money back!
The Martec 50 Comp. Replacement Pool Filter Cartridge is a compatible replacement pool filter cartridge built with 50 square feet of Reemay filter media for the reduction of contaminants in pool and spa water. This compatible Martec spa filter, also known as the Filbur FC-1630, measures 4 15/16" x 14 7/8" with 2 1/8" Open top/bottom styles.