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The Unicel C-7688 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-7688 Comp. Pool & Spa Water Filter has an outer diameter of 7 7/8 inches, with a length of 26 1/8 inches. This Unicel spa filter has an open top and bottom with both having a diameter of 3 1/16 inches. This Unicel C-7688 filter contains 133 square feet of filter media.