1The aquarium filter media ring is fired by high temperature. 2Full of rich variety of natural elements and essential minerals and trace elements. 3Encourages growth of biological colonies and holds large amounts of good bacteria. Great help to restore the natural water quality, and provide the most suitable living environment for your fishes. 4Suitable for fresh water and sea water tank. 5Reduces ammonia and nitrate levels. 6Any problem, please contact our store without hesitation. Honor to serve you! 7The aquarium filter media ring is fired by high temperature. Full of rich variety of natural elements and essential minerals and trace elements. 8Encourages growth of biological colonies and holds large amounts of good bacteria. 9 Great help to restore the natural water quality, and provide the most suitable living environment for your fishes. 10Reduces ammonia and nitrate levels. 11Suitable for fresh water and sea water tank. The aquarium filter media ring is suitable for fresh water and sea water tank. Great help to restore the natural water quality, and provide the most suitable living environment for your fishes. This product can be used in a variety of filters, pls place in the appropriate position of the filter. Features: The aquarium filter media ring is fired by high temperature. Full of rich variety of natural elements and essential minerals and trace elements. Encourages growth of biological colonies and holds large amounts of good bacteria. Great help to restore the natural water quality, and provide the most suitable living environment for your fishes. Suitable for fresh water and sea water tank. Reduces ammonia and nitrate levels. Any problem, please contact our store without hesitation. Honor to serve you! Specification: Name: Aquarium filter media ring Material: Quartz Size: Length: 1.6cm, diameter: 1.6cm Package Information: Package size: 20 * 15 * 8cm / 7.87 * 5.90 * 3.15in Package weight: 391g Plastic Packaging Package List: 100* Aquarium filter media ring 100* Aquarium filter media ring