Tunai Activated carbon is an essential filter media for every aquarium. Removes odour, colours, organic pollutants to keep water crystal clear; removes toxic compounds from fish tank. Phosphate free. Safe for both fresh and saltwater tanks. Fast working and long lasting. Activated carbon is frequently recommended for use in aquarium filters. It keeps aquarium water crystal clear and it can be used in canister filters also. Ready-to-use filter bags, convenient for use with your canister filter, power filter, or pond filter. Bagged for easy handling and precise placement of carbon and ensure granular media not travel thru pumps and pipes. Always rinse carbon media through until the water runs clear before use.