Black Diamond Premium Activated Carbon

A premium activated carbon that eliminates foul odors, unsightly discoloration, and harmful organic substances. Heat-activated bituminous coal-based granules are specially sized (won't damage filter impellers) and far more efficient than inferior wood, coconut, or peat-based carbons. Contains less than 2% moisture, so you are not paying for the water contained in other "prewashed" carbons. For freshwater or marine applications.