The Filbur FC-2630 is the correct replacement for the Unicel C-4350 and for the following filters:

• Grecian Spa 50 sq. ft.

The Filbur FC-2630 Replacement Pool Water Filter has an outer diameter of 4 5/8 inches, with a length of 23 3/4 inches. This Filbur spa filter has an open top and bottom with both having a diameter of 2 1/8 inches. This Filbur FC-2630 filter contains 50 square feet of filter media.