The Eljen GSF (Geotextile Sand Filter)is an alternative for onsite septic leach field systems. Each GSF Module (see figure below) is made up of a geotextile fabric and a plastic core material that work together to provide vertical surface area and oxygen transfer. The GSF System applies treated effluent to the soil, increasing the soil’s long-term acceptance rate. A Specified Sand layer provides additional filtration and prevents saturated conditions. ASTM C-33 sand is well documented and available throughout the country. It is a primary component for construction. With the expansion of civil projects across the country, the availability of ASTM C-33 sand for onsite wastewater projects is diminishing. If an alternative were available for a similar or reduced price, it would increase the use of onsite system use. Some original work was done on the use of geotextiles was done by Dr. Rein Laak and his Ph.D. students at UCONN in the 1970s. The sponsor has access to this research material and papers from them on the geotextiles as well. The objective of this project is to identify a material that is readily available around the US that mimics the filtering ability of ASTM C-33 sand. Options for consideration could include recycled glass, non-woven fabrics, or a combination of components.

Our team collaborated with Mechanical Engineering 18 on this project.