HOT Magnum 250 Pro-System is an efficient, powerful, compact canister filter that is lightweight enough to hang directly on the back of your aquarium. Because it is a Magnum, it comes feature-packed with the ability to convert with ease from a continuous duty mechanical and chemical utility filter to a water polishing filter with micron filtration capability. Comes complete with a Carbon/Media Container and Water Polishing Micron Cartridge and available in models with and without BIO-Wheel wet/dry filtration.