http://www.bulkreefsupply.com/store/products/carbon-and-gfo/media-reactors-filter-bags/jumbo-brs-gfo-and-carbon-reactor.html Designed to be easy to use, setup and maintain the BRS fluidized reactor is perfect for utilizing GFO or Carbon in the aquarium. Our reactors are not only easy to use, but they do away with annoying thumbs screws and the leaky lids common with other reactors. When running GFO we recommend a MJ 1200 pump to operate this reactor. When running carbon we recommend a larger pump to conpensate for the carbon clogging over time, Mag Drive 3s work well. Depending on mounting height and amount of media used you may choose to use a different pump.