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The Unicel C-9970 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-9970 Comp. Pool & Spa Water Filter has an outer diameter of 10 1/16 inches, with a length of 19 5/8 inches. This Unicel pool filter has an open top with a diameter of 3/8 inches, and an open bottom with a diameter of 6 inches. This Unicel C-9970 filter contains 70 square feet of filter media.