When it comes to Carbon, the key factors are a high adsorption level for removing unwanted organic pollutants, and no traceable levels of Phosphate release. Red Sea’s REEF-SPEC Carbon is a carefully selected, premium activated carbon that excels in both adsorption capacity & speed, with no traceable levels of Phosphate being released back into the water. In other words: it cleans the most, works the quickest, and gives the best overall results. For more information on the REEF-SPEC Carbon, visit