Seachem MatrixFeatures: High capacity biofiltration Controls ammonia, nitrite and nitrate High porous enormous surface area (>~700 m2 L) Supports aerobic and anaerobic bacteria species Matrix is a porous inorganic solid about 10 mm in diameter. Each liter provides as much surface (>~700 m2) as 170 liters of plastic balls. Plastic bio materials provide only external surface area, whereas Matrix provides both external and internal macroporous surface area. These