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The Cal Spas 5 X 13 R is a compatible replacement for the following pool and spa filters:
The Cal Spas - 50 Square Foot Spa Filter Cartridge is a replacement pool filter cartridge that measures 4 15/16" x 13 5/16" and features 2 1/8" Open top and bottom styles. This compatible Cal Spas filter replacement offers 50 square feet of media area and media weight of 3 oz.