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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.
Origin
1870-1875
1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for filter-bed

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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9
10
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