| The volcanic biological filter is corrosion resisted, it is inertia, so it never reacts with biological films. 2、Surface’s electric property and hydrophilcity: Volcanic filter’s surface brings positive charge, so it is favorable for the growth of the microorganisms. Its hydrophilcity is very strong, so the attached biological film quantity is large and very fast. 3、The effectives to the biological film activity: as a biological film carrier, the volcanic biological filter is harmless , no suppressive to the fixed microorganisms, the fact proves that it never affects the microorganism’s activity.
poriness：the inside and outside average poriness is about 40%, the resistance to water is ver |
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Yang Kemin
