Abstract: The equipments and the operation principle of the siphon filter in sewage station were introduced. The problems occurred in operation of the siphon filter were analyzed. A reformation method was put forward, in which the air water backwashing technology is adopted to raise the backwashing efficiency of the siphon filter. The method is of important significance for reducing the water consumption in backwashing process, shortening the backwashing time, raising the quality of the output water and lengthening the operation period. 

Key words: air water backwashing, siphon filter, quality of output water, reformation method