Eljen B43

An alternative to onsite septic systems is the Eljen GSF (Geotextile Sand Filter). Each GSF Module is composed of a geotextile fabric and an oxygen transfer material. GSF System adds secondary treated effluent to soil to increase soil’s long-term acceptability. A Specified Sand layer adds filtration and protects against saturated conditions.

Eljen GSF Geotextile sand filter modules are an innovative and multifaceted approach to on-site residential, commercial and municipal wastewater management

Eljen GSF System

  1. NSF Standard 40 has been tested and certified.
  2. There is no stone unturned
  3. Site impact lower
  4. Easy to install and handle, light weight
  5. Greater long-term performance
  6. Installation area is smaller than traditional systems.
  7. Technology and products that are patentable
  8. Two-stage Bio-Matt treatment is used to treat effluent from pretreated plants

Eljen B43 Technology

The Eljen GSF modular treatment component integrates with a soil absorption systems that includes perforated pipes and bio-matt fabrics. It also has cuspated cores and a layer sand above the native soil. The Eljen GSF design offers a larger surface area for biological treatment than the module’s footprint. The Eljen GSF module’s top and sides are covered with anti-siltation geotextile fabric. This protects the soil and sand from any fines. It also allows for effluent storage within it. The B43 module has open air channels that allow for aerobic bacteria growth through the Bio-Matt geotextile interface.

How the GSF System works

Eljen’s GSF (Geotextile Sand Filter), is an alternative to onsite septic field systems. Independent testing by third parties confirms the GSF’s performance under different conditions. The system is made up of a primary treatment area (containing the GSF module) and a second treatment zone (Specified sand layer). A perforated pipe is placed over the GSF Module to distribute septic effluent in the corrugations made by the plastic core.


Eljen Corporation has published the most recent installation instructions. Local regulations must be followed. Eljen Modules should be installed on a 4-foot base of stabilized Specified Sand with the painted stripe facing upwards. The Modules are secured with the supplied metal clamps. A perforated pipe of 4 inches is placed on top. Eljen supplies the cover fabric. Substitutions are not permitted.


  1. It is lightweight and easy to use.
  2. This takes the responsibility of treating and developing biomats from the native soil.
  3. Offers both treatment and disposal on the same footprint.
  4. Site installation is flexible and has a low impact.
  5. Unique design allows for greater biological treatment of contaminants and nutrients.

Primary Treatment Zone

  1. Protects the Specified by a geotextile fabric that is anti-siltation and covers the sides and top of the GSF Module
  2. To distribute septic effluent, the perforated pipe is placed above the GSF module.
  3. The module’s open air channels support aerobic bacterial growth through the modules’ geotextile fabric interface. This is in addition to the traditional absorption system surface area.
  4. The Bio-Matt fabric filters septic effluent. Unique design of the module allows for increased biological treatment surface area that is much larger than its footprint.

Secondary Wastewater Treatment

  1. Specified Sand protects the soil from compaction and acts as a filler to prevent cracks from forming in the ground.
  2. The filtered effluent is drained into the Specified Sand layer. It has a precise grain size that allows for unsaturated flow into native soil.

The groundwater is recharged by the native soil, which acts as the final filter layer.

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