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Seachem Matrix is a high-capacity biomedia that provides housing for your nitrifying and denitrifying bacteria. Unlike conventional ceramics with limited external surface area, Matrix is made of natural material engineered with macro- and micro-porosity, giving you over 700 m²/L of colonizable surface area. That means: Ammonia → Nitrite → Nitrate → Nitrogen gas All in one media, inside your filter. Why it’s essential: - Supports aerobic nitrifiers on the surface - Supports anaerobic denitrifiers

Purigen vs. Matrix Carbon: two filtration tools, two different mechanisms. Purigen is a premium synthetic organic scavenging resin designed to target and remove organic waste before it breaks down into ammonia, nitrite, or nitrate. Unlike standard resins, Purigen works at the molecular level through its macroporous structure, reducing the biochemical oxygen demand (BOD) in your system. It excels at removing tannins, making it especially useful for tanks with driftwood where water discoloration c