1. Friends of A-level chemical and biological cotton. Honeycomb hole. Repeatable cleaning. Never change. Strong pressure. Can be free cutting.

2. The cultivation of fine nitrifying bacteria of the hotbed. Decomposable excreta and feed residue. Improve water quality. Improve fish life.

3. Suitable for sea water tank， fresh water tank， aquatic grass tank， fish tank， fish tank sump or drip filtration.