Eliminates foul odors, unsightly
discoloration and harmful organic substances. Heat activated bituminous coal
based granules are specially sized (won't damage filter impellers). With Black
Diamond, you also get more carbon. As much as 60% of other prewashed carbon
weight is water, not carbon. Black Diamond contains less than 2% moisture, and
is phosphate free!
Rinse carbon and place in an appropriate sized filter bag. Replace carbon 2-4
weeks depending on your aquarium.