Filter Media are used to process waste and remove impurities from the water in your reef tank or freshwater tank. Filters keep your water quality pristine and inhabitants healthy. We typically recommend you use live rock and sand in a reef tank and for inline filters run a Phosphate reactor with carbon or phosphate removers as your inline filters. At Salty Supply we offer many different filter options for serious saltwater aquarists. Some products include refugiums, phosban reactors and hang-on refugiums. We also offer a huge line of the most premium protein skimmers on the market.