摘要:
An apparatus for cleaning loose filtering material in slow water-filled water supply filters, comprising a washing chamber equipped with means for its movement relative to the surface of the loose filtering material being cleaned. Mounted inside the washing chamber are washing tubes to feed clean water into the layer of filtering material to be washed. The washing chamber communicates with a suction pipe which evacuates dirty water therefrom. The chamber is provided with means for regulating its pressure upon the filtering material by controlling its degree of buoyancy.