Boyd’s Chemi-pure Blue Nano Ultimate Filter Media, Nano helps keep your underwater buddies’ home in tip-top shape. This all-in-one filter media comes in a convenient, easy-to-use nylon packet that’s the size of a tea bag, perfect for all your nano-sized applications. It’s specially designed to deliver high-quality filtration for reef, marine and jellyfish aquariums. The premium activated carbon and high-grade ion-exchange resins help reduce organic compounds, toxins, dissolved metals, phosphates, silicates, odors and more! So, help reduce the need for frequent water changes and promote sparkling clear water with Boyd Chemi-pure Blue Filter Media.