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GSF System Description <br /> Primary Treatment Zone <br /> • Perforated pipe is centered above the GSF module to distribute septic effluent over and into <br /> corrugations created by the cuspated core of the geotextile module. <br /> • Septic effluent is filtered through the Bio-Matt fabric.The module's unique design provides increased <br /> surface area for biological treatment that greatly exceeds the module's footprint. <br /> • Open air channels within the module support aerobic bacterial growth on the modules geotextile fabric <br /> interface,surpassing the surface area required for traditional absorption systems. <br /> • An anti-siltation geotextile fabric covers the top and sides of the GSF module and protects the <br /> Specified Sand and soil from clogging, while maintaining effluent storage within the module. <br /> Secondary Treatment Zone <br /> • Effluent drips into the Specified Sand layer and supports unsaturated flow into the native soil. This <br /> Specified Sand/soil interface maintains soil structure, thereby maximizing the available absorption <br /> interface in the native soil. The Specified Sand supports nitrification of the effluent, which reduces <br /> oxygen demand in the soil,thus minimizing soil clogging from anaerobic bacteria. <br /> • The Specified Sand layer also protects the soil from compaction and helps maintain cracks and <br /> crevices in the soil. This preserves the soil's natural infiltration capacity, which is especially <br /> important in finer textured soils, where these large channels are critical for long-term <br /> performance. <br /> • Native soil provides final filtration and allows for groundwater recharge. <br /> FIGURE 1: GSF SYSTEM OPERATION <br /> • Porous Top of the Eljen GSF I Perforated Pipe <br /> allows evapotranspiration and distributes effluent to the <br /> oxygen exchange for better Efjen GSF. Pipe is secured to <br /> effluent treatment. the GSF Modules with preformed <br /> • Anti-Siltation Fabric metal clamps. <br /> keeps fines out of the Efjen GSF Primary Treatment Zone <br /> • Untreated Effluent forms on Bio-MattTM fabric. <br /> Significant fabric provided <br /> • Bio-MattTm Fabric for every ft'of soil interface. <br /> • Cuspated Plastic Core Secondary Treatment Zone <br /> provides separation between forms at sand layer. Long term <br /> layers of Bio-MattTM fabric. acceptance rate of this biomat <br /> Maintains structural integrity of layer is significantly increased as <br /> modules&aids oxygen transfer. compared to conventional systems. <br /> Increases treatment surface <br /> area&effluent storage capacity. Specified Sand Layer <br /> provides additional filtration <br /> • Filtered Effluent y <br /> _ Native Soil or Fill <br /> • Treated Effluent provides final filtration <br /> 2022 California Design&Installation Manual Page 4 www.eljen.com <br />