Airmax CrystalClear Polish AC

Activated Carbon Safe for All Aquatic Life Removes Tannins, Chlorine & Odor Removes Ammonia, Nitrite & Nitrate Includes a 12x18-Inch Mesh Application Bag Polishes Water & Removes Microscopic Debris CrystalClear Polish AC is bituminous coal exposed to extreme heat, which activates the carbon, giving it potent absorbing powers. The carbon has billions of pores that act as hundreds of sponges soaking in many pond pollutants such as tannins, ammonia, nitrite, and nitrate. The result is a polished pond environment.