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The structural form of activated carbon 

Because activated carbon is a porous material, there are many small and large holes complex structure. Under the electron microscope, a coal particle looks like a tiny ant nest and like grains of sand.

Therefore, the surface area exposed to its very broad absorption of impurities. So activated carbon exists in many different forms and structures divided into three basic types: 1. bran powder (Powered - PAC) this is made under the old technology, now commonly used in battery manufacturer, ac-regulation. There are a number of manufacturers use them to cast a glue mixed with charcoal tubes look like 3rd form below. 2. Type particles (Granulated - GAC) are small lumps, cheap, suitable for deodorant. However, the water tends to flow through the gaps between the carbon particles rather than go through the small hole. 3. Type solid (Extruded Solid Block - SB) is the most effective type of filter residue, Coliform bacteria, lead, toxins, reducing chlorine color and deodorant. This type is made from a piece of coal, is forced under pressure formatted to 800 tons so sure in the form of activated carbon in the form of powder is used most widely and most commonly used in the filter water treatment environment.