filter bed definition

  • noun:
    • A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.
    • a pond, the bottom of that will be a filter composed of sand gravel.
    • A pond or tank having a false base covered with sand, and offering to filter river- or pond-waters.
    • filter comprising a layer of sand or gravel for filtering water

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    • A layer of sand or gravel on the…
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