Hagen AquaClear Activated Carbon Insert. This Ultragrade Activated Carbon Insert will improve your aquarium's water color, clarity, and odor without changing the water's characteristics. Safely removes chlorine, smoke and aerosol spray contaminants.
Hagen AquaClear Activated Carbon Insert superior adsorption of imputities and broad spectrum organic compound removal make it one of the best inserts in the market. Supports beneficial bacterial colonies and can be used in both fresh and saltwater aquariums.