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The Caldera 1019301 R is a compatible replacement for the spa filter cartridges:
The Caldera 1019301 Comp. Pool Filter Cartridge is a spa filter replacement that measures 7" x 14 3/4" with a Bar Handle top style and 2 11/16" Open bottom style. This compatible Caldera filter features high quality media and 75 square feet of filter area for the purification of pool/spa water.