• The GSF modules's unique design provides increased surface area for biological treatment that greatly exceeds the module's footprint. Open air channels within the module support aerobic bacterial growth on the Bio-Matt™ geotextile fabric interface.
• An anti-siltation geotextile fabric covers the top and sides of the GSF module and protects the Specified Sand and soil from fines that can clog the sand, while maintaining effluent storage within the module.
Stage 1 Pre-Treatment Zone
• Septic effluent is filtered through the Bio-Matt pre-treatment fabric, which is sized for the long term acceptance rate for septic effluent.
• This extensive membrane provides a significant amount of pre-filtration area per module in an aerobic envelope, exceeding the surface area required for soil infiltration.
Stage 2 Pre-Treatment Zone
• Effluent drips into a Specified Sand layer and supports unsaturated flow into the soil. This sand/soil interface maintains soil structure, thereby maximizing the available absorption interface in the native soil. The sand supports nitrification of the effluent, which reduces oxygen demand in the soil, thus minimizing soil clogging from anaerobic bacteria.
• The Specified Sand layer 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 to long-term performance.
• Native soil provides final filtration and treatment.
