HK LJ and its branch company named S.H.Industrial & Trading Company Based in Datong Shan XI China. And also have lesion contact office in Shen Zhen and in Hong Kong. Datong is the key place to produce activated carbon since this city is rich in coal material and famous as called capital of coal box in China. Activated carbon is made from strictly selected coal by using special technology. It is porous carbon material. Due to its highly porous structure and huge specific surface area, it has very strong adoption capacity. It is mainly used to removal of all kinds of gas, purify water, burn smoke purification, remove the heavy metal (especially Hg), PCDDS, PCDFS.