Marineland Black Diamond Activated Carbon eliminates foul odors, unsightly discoloration, and harmful organic substances that can be found in your home aquarium. Heat activated bituminous coal based granules are specially sized, so they won't damage filter impellers. With Black Diamond, you also get more carbon. As much as 60% of other pre-washed carbon weight is water, not carbon. Black Diamond contains less than 2% moisture, and is completely phosphate free.
Size: 8 oz.