A tank or pond containing a layer of sand or gravel, used for filtering large quantities of liquid.
- When we arrived, we saw that the liquid was not passing through the sand, but was ponding on the surface of the filter bed.
- At the Southernwood filter bed 48 mm of rain was registered.
- The pipe connected the roof to the filter bed that didn't look like a recharge pit.
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Syllabification: fil·ter bed
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