The Marineland Micron Filter fits Marineland Magnum 200 Polishing Internal Canister Filters for freshwater or saltwater aquariums up to 60 gallons as part of a strong filtration system. With a 100 Micron rating, this water polishing filter screens out both large and fine debris for increased water clarity. Designed for no bypass and pleated for added surface area, this mechanical filtration filter helps remove ammonia-producing organic matter.