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Why charcoal to filter impurities in the water?

There are many questions posed on activated carbon, in which we get the most questions is why the activated carbon filters out impurities in the water?

The surface of the charcoal-like surface of the sponge. Explanation is simple charcoal absorbs dirt like a sponge absorbs water.

In essence the surface of activated carbon has gaps (illustration). These openings as the trap dirt makes passing stuck and can not get out. However, the crack of activated carbon fibers are smaller than the openings of powdered or granular activated carbon fibers should have the ability to capture giunhung molecules of air pollution particles such as smoke, odor , the smell of chemicals ... etc.

This creates a special air filtering of fibrous activated carbon fibers should generally be used to produce a gas mask dedicated. Because of this reason that activated carbon is used in line filter impurities out of water.