PhosBan from Two Little Fishies is a popular choice for aquarists due to its ability to effectively remove substances from aquariums without leaching. It has the highest adsorption capacity of any phosphate-filtering media and absorbs organics and other pollutants. Easy to use and non-toxic the media will last several months in typical aquariums and is suited for both saltwater and freshwater. For optimum performance use in conjunction with the TLF PhosBan Reactor 150 or 550. Features: Phosphate-removing filter media that is permanently effective non-toxic and lasts several months in typical aquariums making it great for salt and freshwater Directions: Rinse PhosBan prior to use and place it into a tightly-packed bag or between two layers of fine filter floss; never stir granules. Recommended Usage: 50 g per 50 gal saltwater 50 g per 100 gal freshwater; can safely be used at up to five times