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The Eljen GSF is primarily used for leachfields where advanced treatment is needed to meet environmental needs. It is used in bed and trench designs.

The Eljen GSF A42 (four feet long by two feet wide by seven inches high) requires a longer, thinner trench, which can be a benefit where site restraints and hydraulic needs are a prime consideration.

The Eljen GSF leachfield offer the following advantages:

• Provides advanced treatment in 50 percent less space than aggregate systems
• Proven reliable performance eliminates the need for complicated maintenance and maintenance contracts
• Smaller size and streamlined design significantly reduces overall system cost
• Long term leaching capacity is two to three times that of similar systems
• The only system that pre-treats leachfield effluent with a patented two-stage Bio-Matt filtration process

Made from lightweight recycled material, the GSF leachfield is engineered for superior strength. The Eljen In-Drain, with its prefabricated modular units comprised of geotextile fabric and cuspated spacer cores, provides an alternative to conventional stone and pipe or chamber leaching systems.

Substantial effluent pretreatment occurs within the biomat which develops on the 100 square feet of geotextile fabric and the 400 square feet of cuspated core surface area in each 12-square foot Type B In-Drain unit.

This internal passive pretreatment protects both the soil long-term acceptance rate (LTAR) and groundwater quality while providing reduced system trench length or leach bed footprint. At 7 inches thick, In-Drains provide the lowest product profile, thus reducing system finished grade.

Benefits of the In-Drain include:

• Pretreatment of effluent via a two-stage biomat
• Greater long-term leaching capacity maintained
• Smaller area required than conventional systems
• Has lower site impact and requires less off-site fill
• Fabricated of lightweight recycled materials
• Excellent documented long-term track record
• 10-year warranty

Laboratory analysis of treated effluent extracted from below the In-Drains has confirmed Eljen's claims of substantial effluent pretreatment (over 50% BOD reduction) provided by the biomat at the geotextile fabric and cuspated core surfaces.

In-Drains installed in a 6-inch layer of washed concrete sand can provide secondary treatment for typical septic tank effluent.

In-Drain passive pretreatment systems require only standard periodic inspection and pumping of the septic tank.