|Marineland's Black Diamond Premium Activated Carbon|
Phosphate free. Ideal for all your filtration needs. Keeps aquarium water healthy and sparkling long after other carbons quit. Up to 3 times more effective, works faster, lasts longer. More pure activated carbon. As much as 60% of prewashed carbon weight is water, not carbon. Unlike other carbons, Black Diamond contains less than 2% moisture. More carbon, better value. Laboratory tested and proven more effective at removing foul oders, unsightly discoloration and harmful dissolved organic waste.