filter bed

noun

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

Origin of filter bed

First recorded in 1870–75

Words nearby filter bed

filosus, filovirus, fils, filt., filter, filter bed, filter bubble, filter cake, filter factor, filter feeder, filter feeding

British Dictionary definitions for filter bed

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