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