1.Maded by natural quartzite with high temperature treatment to ensure solid formation. Contain steady and beneficial chemical elements such as oxidized calcium, Mg, potassium and sodium to help creating idea environment in bacteria colonization.
2.The ring with large surface area boosts nitrifying bacteria growing that effectively break down ammonia, nitrite acid and nitrate.
3.Healthy biological system provides cleaner water and healthier fish.
4.The technologically advanced ring is durable and improves the quality of your aquarium water.

1.It can be use in top, bottom or extemal filters.
2.It is suitable for almost filters in the market, both fresh and saltwater aquariums. Briefly rinse the mesh bag and the rings with flowing water.
3.Used in both fresh and salt water

Dimension：diameter 16x16 mm