Premium quality replacement filter cartridge. Made to high standards with no compromises in quality, and without cutting corners. Dimensions: Length 688mm Diameter 230mm Top Hole 74mm Bottom Hole 74mm Leading-edge production and processes Magnum Filters has grown from its origins in 1982 to become the market leader in Australasia through a combination of exceptional product quality, innovative processes, and highly trained and committed staff. They operate out of a purpose-built factory in Henderson, West Auckland. With 50,000sq ft premises and state-of-the-art customized machinery. Magnum Filters exclusively uses high-quality, USA-made, Reemay filtration fabric in all spa and pool cartridges. Reemay Cartridge Filter Element Media is made of continuous filaments and does not weave out. It is thicker, heavier and sturdier making it better at capturing smaller particles.