Marineland Black Diamond Premium Activated Carbon is a highly effective filter media designed for aquariums. This specially formulated carbon, composed of heat-activated, bituminous coal-based material, efficiently removes odors, discoloration, and impurities from the water, ensuring a crystal clear and sparkling environment for your aquatic pets. With its long-lasting efficiency, this 5-ounce pack is ideal for all types of aquarium filters. Trust Marineland for the most reliable and technically advanced aquarium products available on the market.