Bullfrog 50 spa cartridge filter element swimming pool magnum reemay cleaning Generic Magnum swimming pool cartridge to suit - Bull Frog 50 Generic Magnum Cartridge Height: 146mm Width: 200mm Top Semi Circle Handle Bottom 59mm SAE (course) thread Magnum Pool Filter Cartridges Swimming pool filter cartridges are NOT all the same. Be sure to choose a quality cartridge and protect your swimming pool equipment and your family with a clean pool. We only supply quality Magnum swimming pool cartridges. Quality cartridges will cost you less in the long run and help protect your valuable pool equipment. Magnum filter cartridges are made in New Zealand offering the highest quality cartridge on the market. Don?t settle for second rate or bargain cartridges which simply don?t last or worst still simply don?t work. Allow your pool and spa to function at full potential and use quality Magnum cleaning cartridges. Using high quality raw materials and the most up-to-to manufacturing machinery and processes, Magnum cartridges offer continuous filament made from Reemay spun-bond polyester filtration fabric which will reduce wear out.