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bacteria bed

noun

  1. a layer of sand or gravel used to expose sewage effluent, in its final stages, to air and the action of microorganisms Compare filter bed
“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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