Provide lava stone,volcanic rock,basalt,Beijing Kaibiyuan

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The volcanic biological filter is crosion resisted, it is inertia, so it never reacts with biological films. 2Surfaces electric property hydrophilcity Volcanic filters surface brings positive charge, so it is favable f the growt
h of the microganisms. Its hydrophilcity is very strong, so the attached biological film quantity is large very fast. 3The effectives to the biological film activity as a biological film carrier, the volcanic biological filter is harmless , no suppressive to the fixed microganisms, the fact proves that it never affects the microganisms activity.

pinessthe inside outside average piness is about 40%, the resistance to water is very small, comparing with the same kind filter, it costs less, but can reach the expected filtering purpose. 2The specific surface area the specific surface area is large, the opening holes are many inertia, so it is suitable f microganism to touch fm film, keeping

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