Matrixâ„¢ is a high porosity biomedia that provides efficient biofiltration for the removal of nitrogenous waste. Matrixâ„¢ is a porous inorganic solid about 10 mm in diameter. Each liter of Matrixâ„¢ provides as much surface (>~700 m2) as 170 liters of plastic balls! Plastic bio-materials provide only external surface area, whereas Matrixâ„¢ provides both external and internal macroporous surface area. These macropores are ideally sized for the support of nitrifying and denitrifying bacteria. This allows Matrixâ„¢, unlike other forms of biomedia, to remove nitrate along with ammonia and nitrite, simultaneously and in the same filter.