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