Marineland® brand is the world?s leading brand of innovative equipment and environments for consumers wishing to create the ultimate aquatic showcase. Committed to fishkeeping success for over 40 years the brand is the professional?s choice for commercial display systems and scientific research. Whatever you?re passionate about ? freshwater or saltwater big or small beauty or science ? make your aquarium your own. The Marineland® Micron Cartridge fits all Marineland Magnum® Canister Filters and Magnum Polishing Internal Canister Filters as part of a powerful filtration system. This high-efficiency water polishing filter cartridge removes fine debris ensuring a clean aquatic environment. Leave it in place for continuous water polishing. Flow will be diminished when this cartridge becomes clogged. Clean or replace the Marineland Micron Cartridge monthly ? see label for complete instructions for use and replacement. Clean sparkling water is the mark of a healthy thriving aquarium. The amount of filtration needed to maintain an aquarium depends on a number of variables. These include tank size individual maintenance habits and fish population. Whatever your individual needs Marineland brand has the filtration products you need to deliver on-target advanced filtration.