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filter bed

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filter bed

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

Origin:
1870–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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filter bed  
n.  A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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