Marineland Black Diamond Media Premium Activated Carbon. Black Diamond® Media Premium Activated Carbon eliminates discoloration, odors, and impurities...and keeps on doing it long after other carbons quit. Heat-activated bituminous coal-based Black Diamond Media granules are specially sized and far more efficient than inferior coconut, wood or peat-based carbons. Removes more discoloration, odors, and impurities* For sparkling clean water Ideal for all aquarium filters. Size: 10 oz (283 g)