Seachem Matrix is a high porosity biomedia that provides efficient biofiltration for the removal of nitrogenous waste. Matrix is porous inorganic solid about 10 mm in diameter. Each liter of Matrix provides more surface (> 700 m2) and 170 liters of plastic balls! Biomedical materials provide more external surface area, while Matrix provides both external and internal macroporous surface areas. These macropores are ideally sized for the support of nitrifying and denitrifying bacteria. This allows Matrix ™ to be combined with other forms of biomedicine, to remove nitrate along with ammonia and nitrite, simultaneously and in the same filter.

Matrix ™ is completely inert and will not breakdown. It need not be replaced. Since the majority of the bacteria are internal, Matrix ™ can be used when needed without damaging the filter. Matrix ™ is compatible with all types of wet or wet-dry filters.