Eljen - Model GSF Series -Geotextile Sand Filter

• Pretreats effluent with a two-stage biomat
• 3rd party independent testing data shows that the GSF provides advanced treatment of septic Tank effluent to better than secondary levels
• Greater long-term performance
• Requires a much smaller installation area
• Patented products and technology
• Made from recycled materials
• No stone required
• Lower site impact
• Lightweight

A Specified Sand Layer Provides Additional Filtration, And Prevents Saturated Conditions. Each GSF Module 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.

Primary Treatment Zone

• Perforated pipe is centered above the GSF Module to distribute septic effluent over and into corrugations created by the cuspated core of the GSF Module.
• Septic effluent is filtered through the Bio-Matt fabric. The GSF Module’s unique design provides increased surface area for biological treatment that greatly exceeds the Module’s footprint.
• Open air channels within the GSF Module support aerobic bacterial growth on the Module`s geotextile fabric interface, surpassing the surface area required for traditional absorption systems.
• An anti-siltation geotextile fabric covers the top and sides of the GSF Module and protects the Specified Sand and soil from clogging, while maintaining effluent storage within the Module.

Secondary Treatment Zone

• Effluent drips into the Specified Sand layer and supports unsaturated flow into the native soil. This Specified Sand/soil interface maintains soil structure, thereby maximizing the available absorption interface in the native soil. The Specified Sand supports nitrification of the effluent, which reduces oxygen demand in the soil, thus minimizing soil clogging from anaerobic bacteria.
• The Specified Sand layer also protects the soil from compaction and helps maintain cracks and crevices in the soil. This preserves the soil’s natural infiltration capacity, which is especially important in finer textured soils, where these large channels are critical for long-term performance.
• Native soil provides final filtration and allows for groundwater recharge.

Installation shall comply with the latest installation instructions published by Eljen Corporation and abide by local regulations. Eljen Modules are installed along their 4-foot lengths on a base of stabilized Specified Sand, with the painted stripe facing up. A 4? perforated pipe is centered on top of the Modules, and is secured with supplied metal clamps (one per Module). Cover fabric is supplied by Eljen and substitutions are not allowed. Specified Sand is placed along both sides of the Module, and at the beginning and end of each row once the cover fabric is in place.

For more specifications and detailed installation instructions consult the appropriate Design and Installation Manual.