Exo Terra Filter Carbon Bag for FX-200: A replacement activated carbon filter bag for the Exo Terra FX-200 canister filter. This carbon insert helps eliminate water discoloration and odors by adsorbing impurities and chemicals in aquatic terrarium water. Easy to install, it improves water clarity and quality for turtles or aquatic reptiles, and should be replaced regularly as part of filter maintenance to ensure optimal filtration performance.