Marina Zeo-Carb is a mixture of ammonia remover and high quality carbon. Combining the effects of two products into one allowing you more space in your filter system for other types of media. High Quality Blend of Marina Carbon and Marina Ammonia Remover Eliminates Liquefied Impurities Removes Toxic Ammonia Reulting in a Healthy Aquarium For Freshwater Use Only For CF20, CF40, CF60, CF80