CPR Aquatic's Mini and Nano Tumbler Media Reactors are reliable options for running filtration media in an aquarium. The upward flow design of the Tumblers promotes fluidization of media, so it is used efficiently and your tank stays clean with less media over time. Bio-pellets, carbon, ion-based resins, and phosphate removing media can all be used. Plus, their small size allows for use in confined spaces. The Tumblers require only 3-4 watts of power and their secure lid assembly makes maintenance and media exchange simple. Add a Tumbler Reactor to enjoy cleaner tanks and easier maintenance. Features: Small footprint, easy installation, multi media options, adjustable fluidization; includes: feed pump, body, lid/cover, 2 coarse media screens (Mini only), and suction cups (Mini only). Nano (TNR1): 3-1/2" L x 2-3/8" W x 11-3/