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TechDrain Drainage composites are prefabricated subsurface drainage products which directly replaces the granular drainage layer. They normally consist of a polymer core sheet core covered by a geotextile acting as a ?lter and separator on one or both sides. This allows water to pass through into the polymer core but prevent the soil to washing through. TechDrain's multi-directional ?ow design allows a continuous path for water discharge, eliminating the potential for hydrostatic pressure build up. It allows water to pass freely into the drainage core, where it is gravity fed into the main drainage collection system.