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Abstract

A method and apparatus for air scouring a layered filter bed wherein the air is dispersed into the finer particles of the bed without disturbing the coarse large aggregate in the lower portion of the bed to prevent inter-mixing of the fine aggregate with the large aggregate. The filter support generally comprises a corrugated filter support forming channels having peaks to provide air channels for distribution of air into air ducts communicating with the fine particles of the filter bed. The valleys between the peaks provide an area for the coarse large aggregate of the filter bed such that the filtered liquid flows through the upper portion of the bed and into the large aggregate and out outlet apertures in the filter support into the lower portion of the channels formed by the filter support.

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