Advanced Treatment Units
Eljen Geotextile Sand FilterThe Eljen GSF, or Geotextile Sand Filter system, is designed to provide treatment and dispersal in the same footprint with easy installation and minimal maintenance. It is used for commercial and residential applications. Utilizing a two-stage pretreatment process, the geotextile modules apply filtered septic tank effluent to the soil, increasing the soil’s ability to accept effluent and increase the long-term acceptance rate. Its design provides increased surface area for biological treatment that greatly exceeds the module’s absorption area. Open-air channels within the module support aerobic bacterial growth on the module’s geotextile fabric interface, surpassing the














