Ammo Carb is a unique blend of high grade activated carbon and ammonia-removing media for freshwater aquariums and ponds. The activated carbon removes dissolved organic waste, colors and odors. The ammonia-removing media removes toxic ammonia produced by fish waste, uneaten food and organic debris as well as chloramine from tap water. Ammo-Carb is a double filtration system in your aquarium. Shipping weight: 1 1/2 lbs.