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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.

Anaerobic balls can be used for both freshwater and marine water.  

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, it will release many kinds of minerals such as K, Fe, Zn etc to benefit aquatic life.

Therefore, the water is purified and they can maintain the natural balance of water.