Mountain Tree Anaerobic Ball/Ring
Mesh bag package allows you to use and maintain it conveniently.
It is recommended to place it in the second or the third chamber in sumps or canister filters.
Here is its hollow structures, which provides an ideal home for anaerobes to cave in.
Also, it connects many pieces of hollow balls to aid in culturing of anaerobic bacteria.
Besides that, it will release many kinds of minerals such as K, Fe, Zn etc to benefit aquatic life.
Anaerobic balls can be used for both freshwater and marine water.