Feature:1. The aquarium filter media ring is fired by high temperature.2. Full of rich variety of natural elements and essential minerals and trace elements.3. 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.4. Suitable for fresh water and sea water tank.5. Reduces ammonia and nitrate levels.6. Any problem, please contact our store without hesitation. Honor to serve you!Specification: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 ringMaterial: QuartzSize: Length: 1.6cm, diameter: 1.6cm​Package Information: Package size: 16 * 12 * 6cm / 6.30 * 4.72 * 2.36inPackage weight: 170gPlastic PackagingPackage List:50* Aquarium filter media ringPackage List:50* Aquarium filter media ring