Wire-wrapped rod-based well screens
Wire-wrapped pipe-based well
screens
Perforated liners

National Groundwater Association
The Groundwater Foundation
The Office of Groundwater and Drinking Water
Water Resources in the U.S.
Wellowner.org

Everyday 83.3 billion gallons of groundwater are pumped in the United States. That’s approximately 2.49 trillion gallons per month, or 29.88 trillion gallons per year. Forty-seven percent of the U.S. population depends on groundwater for its drinking water supply.

Many water wells penetrate unconsolidated material and require installation of casing and a well screen to prevent inflow of sediment and possible wellbore collapse. The space around the casing is usually sealed with grouting material of either neat cement or bentonite clay to prevent contamination by water draining from the surface downward around the outside of the casing.

Well screens (filtering devices) are attached to the bottom of the casing, allowing water to move through the well, while keeping out most gravel and sand. The most popular filtering devices for water wells are continuous slot (wire-wrapped) screens and perforated liners.

Continuous slot screens are usually made of wire wrapped around a series of vertical rods. Perforated liners feature slots or holes cut or drilled into steel or plastic casing at set distances.

Alloy Screen Works is a leading independent manufacturer of rod-based wire wrapped well screens and perforated liners.