Kent Marine Reef Carbon for Aquariums, 1-Gallon Bucket
Removes organic pollutants, stains and entrained toxic gases in marine and freshwater aquariums or ponds. Contains the finest pelletized activated bituminous coal based carbon. Pore size is in the 20 to 2,000 angstrom range, ideally suited for removal of large organic molecules. Super activated with very high iodine and molasses numbers.