LANDEN BioRing is a hollow ring-shaped ceramic filter media. The surface has a large number of pore structures that provide an ideal colonization environment for nitrifying bacteria. In addition, BioRing's hollow structure allows oxygen in the water stream to pass through easily, which is favorable for aerobic bacteria growth. It removes nitrite and ammonia nitrogen from the water, providing long-term stable filtration performance for the aquarium. LANDEN BioRing is stable in nature, will not affect PH and GH values, can be reused after rinsing, and is suitable for both freshwater and saltwater aquariums.