sand filter bed
1Filter bed — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …
2filter bed — n. a tank, covered trench, etc. with a sand or gravel bottom, used to filter water, sewage, etc …
3filter bed — fil′ter bed n. civ a pond or tank having a false bottom covered with sand and serving to filter river or pond waters • Etymology: 1870–75 …
4filter bed — /ˈfɪltə bɛd/ (say filtuh bed) noun a layer of sand, gravel, charcoal, etc., in a pond, tank, or container, which serves to filter impurities out of the water which flows through it …
5filter bed — noun filter consisting of a layer of sand or gravel for filtering water • Hypernyms: ↑filter …
6filter bed — a pond or tank having a false bottom covered with sand and serving to filter river or pond waters. [1870 75] * * * …
7filter bed — noun Date: circa 1874 a sand or gravel bed for filtering water or sewage …
8filter bed — noun a tank or pond containing a layer of sand or gravel, used for filtering large quantities of liquid …
9Slow sand filter — Slow sand filters are used in water purification for treating raw water to produce a potable product. They are typically 1 to 2 metres deep, can be rectangular or cylindrical in cross section and are used primarily to treat surface water. The… …
10Rapid sand filter — The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal water treatment facilities. Rapid sand filters use relatively coarse sand and other granular media to remove particles… …
