Abstract: A gravelless drainfield and drain panel product for all legal gravity and pressure dosed drain configurations for trenches, beds, mounds and elevated systems and foundation and other drain panel applications. The product allows for appropriate reduction in drainfield sizing. Individual pieces of expanded polymer aggregate with three or more fingers are connected where they touch to form a variety of rigid porous panels and blocks of randomly disposed, interconnected, high-surface-area, high-void space elements of light weight expanded polymer material. For the drainfield product, a main pipe for gravity, low-pressure dosing, or drip irrigation receives a flow of liquid in the form of wastewater effluent, gray water, irrigation water or run-off and is held in place by a positioner. A drain panel may be placed against a structure for structural drainage.