Seachem Matrix is a highly effective, high porosity biomedia designed for superior biofiltration in both freshwater and saltwater aquariums. This porous inorganic solid efficiently removes all forms of nitrogenous waste, including ammonia, nitrite, and crucially, nitrate, from the water column. Each liter of Matrix offers an astounding surface area of over 700 square meters, comparable to 170 liters of conventional plastic bio-balls, thanks to its unique internal macroporous structure. These ideal macropores provide the perfect environment for supporting both nitrifying and denitrifying bacteria, allowing for simultaneous removal of all nitrogenous compounds within a single filter. At approximately 10mm in diameter, it is sufficiently large for most applications without requiring a filter bag, is completely inert, and will not break down, meaning it never needs replacement. This product is an excellent choice for reef aquarists and freshwater hobbyists alike who seek a durable, low-maintenance, and exceptionally efficient biological filter media. By enabling the removal of nitrate alongside ammonia and nitrite in the same filter, Seachem Matrix simplifies filtration while promoting a more stable and healthier aquatic environment, making it a cornerstone for advanced aquarium husbandry.