Marineland Black Diamond Premium Activated Carbon 10 Ounces, Filter Media for Aquariums

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. Black Diamond Media works as much as twice as fast as the competition.