The volcanic rocks have strong abilities to absorb the harmful substances in the air, such as formaldehyde, radiation substances, and other suspensions.
The characteristics:
1.Natural, honeycomb, cellular
2.Positive charges on the surface for the tiny organisms
Good hydrophilicity
3.Acid resistance, alkali resistance, corrosion resistance, no pollution, and no radiation
4.Heat preservation, heat insulation and sound absorption
5.The best growth environment for the zoogloea
6.The odor removal abilities