AquaClear 50 Activated Carbon Inserts is replacement filter media for the AquaClear 50 Power Filter. AquaClear 50 Activated Carbon Filter Insert improves water clarity in fresh and saltwater aquariums. Exclusively designed for the AquaClear 50 Power Filter, it provides superior adsorption qualities, which eliminate odors, discoloration and impurities. AquaClear creates a wide variety of products for freshwater tanks such as fish tank accessories, fish tank decorations, and aquarium filter media that is perfect for large and small fish tanks.