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The Filbur FC-1963 is the correct compatible replacement that fits:
The Filbur FC-1963 Pentair Quad DE 100 Pool Spa Filter combines the filtering superiority of Diatomaceous Earth (D.E.) grids with the convenience of a filter cartridge. D.E. filter grids reduce impurities down to 5 microns, leaving your pool water clean and sparkling clear. Please note that the Pentair Quad D.E. 100 requires (4) FC-1963 cartridges.
The Filbur FC-1963 specifications: