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The PLBS50 Compatible is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The PLBS50 Compatible Pool & Spa Water Filter has an outer diameter of 5 5/16 inches, with a length of 10 1/8 inches. This Unicel pool filter has an open top and bottom with both having a diameter of 2 1/8 inches. This PLBS50 filter contains 50 square feet of filter media.