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filter bed

a pond or tank having a false bottom covered with sand and serving to filter river or pond waters.
Origin of filter bed
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for filter bed
  • Do not allow the septic tank to fill with solids to the point that they flow over into the rock-plant filter bed.
  • In placing the anthracite in the filters, extreme care shall be taken to avoid disturbing the gravel filter bed.
  • Dry water quality swale: consists of an open channel with a filter bed of permeable soils overlaying an underdrain system.
  • Wastewater is distributed over the top of the filter bed through which wastewater is trickled.
  • The surface of the filter bed should be level to ensure equal distribution of flow in the bed.
  • The former filter bed area is higher than the wetlands to the north.
  • The filter bed was prepared as it would be for an actual burn.
  • The microorganism utilize the oxygen on the nitrate and leaves nitrogen gas bubbles in the filter bed.
  • As the water moves through the media, larger impurities are removed in the upper layer of the filter bed.
  • Note the characteristics of the effluent coming out of the manifold this may indicate that the filter bed may need servicing.
British Dictionary definitions for filter bed

filter bed

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
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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