The Marineland Magnum 200 Rite-Size TC Water Polishing Filter fits the Marineland Magnum 200 Polishing Internal Canister Filter for freshwater or saltwater aquariums up to 60 gallons as part of a powerful filtration system. With a 100 Micron rating, this water polishing filter screens out both large and fine debris for crystal clean water. Designed for no bypass and pleated for added surface area, our mechanical filtration filter helps remove ammonia-producing organic matter. The micron polishing filter is intended for overnight use, to be removed after 24 hours or sooner depending on reduced flow.