Kent Marine Reef Carbon removes organic pollutants; stains; and entrained toxic gases in marine and freshwater aquariums or ponds. Contains the finest pelletized activated bituminous and coral 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. Less than 0.2% ash making it suitable for sensitive species such as discus. Will not leach phosphates or promote undesirable algae growth; suited to sensitive reef systems Engineered for water flow; will not clog easily like small granular or pelleted carbons. Out performs any carbon especially coconut shell. Can be used in many applications; including power filters; canister filters; and wet/dry filters & sumps. For more information on chemical filtration; please see our article on Aquarium Filter Maintenance.