Excel Filters 45 sqft Sunrise Spas XLS611 fits Cartridge Unicel 6CH-49, Pleatco PPG50P4, PDC500-AFS, Filbur FC-0314 Excel Filters are made in the USA to ensure highest quality, which is easy to clean and long useful life Proprietary point bond media for the industry's most efficient and effective filtration Replaces cartridge unicel 6ch-49 pleatco ppg50p4, pdc500-afs filbur fc-0314 Open flow core for optimal flow dynamics and less energy consumption during filtration process Durable, reinforced banding and uniform pleats provides effective dirt loading and ease of cleaning