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The Sundance 6540-502 R is a compatible replacement for the following pool and spa filters:
The Sundance Spas 6540-502 Comp. Pool Filter Cartridge has a diameter of 7 3/4 inches, and a length of 5 inches. This spa filter has both an open top and an open bottom, and each has a diameter of 4 1/16 inches. This pool filter cartridge will keep the water in your pool or spa clean and clear.