Dennerle Nano Bio Filter Granules DE-BIO
These granules are high-performance, biological, long-term filter media. Made from top-quality sintered glass, they deliver effective pollutant removal. Dennerle granules have a large colonization surface area for beneficial bacteria to live. This product is perfect for use in the Nano Filter Extension.
Suggested use: Replace half the granules every 3 months. Do not replace all of your granules at the same time, or you will lose too much good bacteria.