API Activated Filter Carbon Aquarium Filtration Media Contains one (1) API ACTIVATED FILTER CARBON Aquarium Filtration Media 11-Ounce Box Clears aquarium water. Removes organic waste, colors, and odors in freshwater, saltwater, and reef aquariums All-natural. Use when setting up a new aquarium or in established aquariums to improve water clarity, remove dissolved organic waste, colors, odors, or medications.