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filter bed

noun

  1. a pond or tank having a false bottom covered with sand and serving to filter river or pond waters.


filter bed

noun

  1. a layer of sand or gravel in a tank or reservoir through which a liquid is passed so as to purify it Compare bacteria bed
  2. any layer of material through which a liquid is passed so as to filter it
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of filter bed1

First recorded in 1870–75
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Example Sentences

This valve is opened, and the watery portion is allowed to escape into a sand filter bed.

So that the last step of our artificial filtration is simply an imitation of nature's great filter-bed.

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