Established in 1970, Eljen Corporation created the world’s first prefabricated drainage system for foundation drainage and erosion control applications. In 1982, we introduced our Geotextile Sand Filter products for the passive advanced treatment of onsite wastewater in residential and commercial applications.
Since the first installations, the system has shown it is versatile and proven and is 100% passive in gravity-dosed designs. This system can also be used with a pump for pressure-dosed and pump-to-gravity configurations.
The high flexibility of the system and its ability to be used in multiple applications makes the GSF a go-to for designers. Systems can be configured into trenches, beds or mounds, and are a solution for tight lots, high water tables, sloping sites and poor soils. The system excels at intermittent use sites like campgrounds and seasonal homes, as there is no startup time or procedures needed (third-party testing shows treatment begins on day one) and maintenance requirements are low with no replacement media or parts needed.
The GSF’s unique design provides treatment and dispersal in the same footprint while keeping installations easy and maintenance minimal. In the primary treatment zone, open-air channels within each module support aerobic bacterial growth on the module’s geotextile fabric, which provides increased surface area for biological treatment. The GSF Module provides biomat management and takes the burden treatment off of the native soil.
The secondary treatment zone supports unsaturated flow into the soil and works to minimize clogging from anaerobic bacteria. It also protects the soil from compaction and helps maintain cracks and crevices in the soil, preserving the soil’s natural infiltration capacity, which is especially important in fine-textured soils where these channels are critical for long-term performance.
The GSF system can also be used as a denitrification system (GSF-TN), where a tertiary treatment zone includes a carbon source mixture to create an anaerobic zone that reduces total nitrogen. Once effluent passes through this layer, limestone rock balances the pH before the final filtration into the native soil. While the GSF product is highly successful, the real success of the product comes from our team’s work with the designer, installer, regulator and homeowner.
Eljen’s team is made of leaders – veterans who served, who now serve the onsite industry’s needs. The federal government recognized Eljen’s team through the HIRE Vets award program from 2019 to 2023. Based in Windsor, Connecticut, Eljen produces products that are installed throughout the world. They are currently celebrating over 50 years of innovation and success and look forward to being a part of your future septic projects.
800-444-1359 | info@eljen.com | www.eljen.com
