Speeds nitrification and water clarity. Ideal for nitrifying bacteria to colonize and thrive on. Provides the highest surface area per unit volume for superior biological filtration. Excellent for oxygen and gas exchange. Can be snapped together to form a bio-cord. Contains select strains of Nitrosomonas, Nitrospira, and Nitrobacter - allows conversion from ammonia to nitrite, nitrite to nitrate. Treats 80 sq. ft. surface area.