The reconst ructing practice of the circulation of polluted water in the Fi rst Ironw orks of Ping xiangIron and S teel Co., Ltd.is int roduced.After a variety of water quality had been analy sed, the reconst ruct ionplan w as determined to build 3 ci rculation systems.They are the circulation in the cooling water in the blast furnace, in the f lushing sediment water and in the washing water for coal gas.The key equipment in the last oneint roduced emphatically is the ef ficient cleaning pool.It s principle of t reating the pollutant is expounded.Thetotal investment is $8 180 000.Af ter running, the 3 circulating systems have achieved the desig ned capacity.What deserves commendation especially is that the circulat ion reconst ruction of the washing water is very successful.The suspended solid in the exit water is o nly 35.4 mg/L and it s handling rate reaches 94.5 %.Thisshows that the clearing pool of fers another efficient way to handle this gas like, light, thin and slig ht ly sticky pollutantin water.