1.Formed by natural quartzite with high temperature treatment to ensure solid formation.Contains steady and beneflcial chemical elements such as oxidized calcium,Mg,potassium and sodium to help creating idea environment in bacteria colonization.
2.This products large surface area promotes the growth of nitrifying bacteria that effectively break down ammonia,nitrite acid and nitrate.
3.A healthier biological system means cleaner water and healthier fish.
4.This technologically advanced product is durable and improves the quality of your aquarium water.

◆Product Size－（M）：Diameter15 X high15MM
◆Product Size－（S）：Diameter12 Xhigh12MM