Excel Filters Pool and SPA Filter, XLS-917, Replacement Cartridge for Waterway 150, Leisure Bay, Also Replaces Pleatco PWW150-4, Unicel, C-9403, Filbur FC-2969 Unlike most competing filters, Excel Filters are made in the USA to ensure highest quality Proprietary point bond media for the industry's most efficient and effective filtration Easy to clean and long useful life 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