JTOP Co.,Ltd. has developed the activated carbon filtration unit equipped with the special regeneration system. Regeneration is conducted by overheated steam injection, which volatize organic substances adsorbed on the activated carbon. After regeneration, filtration performance can be recovered to the same level as fresh activated carbon. This filtration and regeneration cycle can be effectviely applied for purification treatment of wastewater which includes various organic compounds, at low cost.