Black Diamond^® 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 granules are specially sized and far more efficient than inferior coconut, wood or peat-based carbons. Premium Black Diamond works as much as twice as fast as the competition. 

Package Description: 40 oz.

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1. Place in media bag or media basket and rinse thoroughly in cold water to eliminate dust.
2. Replace immediately when effectiveness diminishes, usually indicated by smells or discoloration of aquarium water. Otherwise, replace every 4-6 weeks.

Note: Carbon loses effectiveness over time. Replacement frequency depends on fish population, waste loads, and water conditions.