| 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 growt
h 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 v |
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Yang Kemin
