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aerofilter

noun
aero·​fil·​ter | \ˈer-ō-ˌfil-tər\

Definition of aerofilter 

: a sewage filter bed that employs coarse material and is operated at relatively high speed often with recirculation

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First Known Use of aerofilter

1930, in the meaning defined above

History and Etymology for aerofilter

aero- + filter entry 1

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The first known use of aerofilter was in 1930

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