Well Screen - The intake section of a well that allows water to flow freely into the well from water-saturated materials and serves as a structural retainer to support the bore hole in unconsolidated material.

a filtering device attached to the bottom of the well casing and serves as the water intake portion of the well

a filtering device that allows ground water from unconsolidated and semiconsolidated aquifers to enter the well while at the same time keeping the majority of sand and gravel out of the well and out of the pump