A great quality replacement filter cartridge that can handle the top load of 25 sq ft. It is best for Jacuzzi Whirlpool Bath (front load), Jacuzzi Brothers, Aquatic Industries, Echo series, Competition Pool Products, Gatsby Spas, Apollo Spas, Safari Spas, Cantar, Blue Ridge, Seven Seas Spas, Atlantic Pool Products (Canada). It can replace Unicel # C-5601, Pleatco # PJW23, Filbur # FC-1330 and has OEM # 43-2954-01-R as other technical specification.