Method and apparatus for deflecting granular material away from the outlet of a filtration bed

摘要: A liquid is filtered through a bed 7 of granular material and cleaning the conducted, when necessary, by upflow wash water orifices 9 air 12 positioned mid-way between 9. An overflow 13 defines free space 15 above baffle formed elements 18, 19 20 surrounds outlet. During flow upwardly at rates such that some entrained upflowing bubbles could be carried to but substantially all separated from entraining or near top 15.