COMMERCIAL
Version :
GSF
System :
Modular
Lifespan :
+ 20 years
Application :
Commercial
ELJEN
A passive and effective solution
ELJEN GSF is used in hundreds of thousands of on-site wastewater treatment systems across North America in residential, commercial, institutional, and community applications. It is one of the only technologies tested in winter conditions that has demonstrated outstanding performance even in cold weather. Its compatibility with Canada's harsh climate and its unique features simplicity, no mechanical components, no need for electricity, and high-quality treated wastewater make it a wise choice.
Considered one of the best technologies available, it stands out for several reasons:
- 100% passive (no pump, no aerator, no alarm, no electricity required)
- High performance enabling reduction in required floor space
- Longer life expectancy
- Proven process for over 45 years
- Modular and capable of treating a wide range of wastewater flows
- Adaptable to all types of terrain
- No maintenance (if required by your regulations, an inspection with or without sampling may be required)
ELJEN GSF: a sustainable and economical solution
With a lifespan that can easily exceed 20 years, the ELJEN GSF is undoubtedly your last septic system and one of the most economical solutions among the advanced treatment systems available on the market.
A solution suited to a wide variety of projects
Whether for a campground, resort, commercial building, school, or even an entire residential development, ELJEN GSF is the solution of choice for your projects.
Distribution and service in Canada
ELJEN GSF modules are distributed in Quebec, Ontario, Manitoba, and the Maritimes by Enviro-STEP Technologies or one of its regional distributors.
Technical support (free and comprehensive)
Our sales department can evaluate your project free of charge, and our team of engineers supports consultants by performing:
- Dimensioning calculations
- Technical drawings required to obtain permits
How it works
Optimized two-stage biofiltration treatment
Step 1
The first stage of treatment takes place inside the patented ELJEN GSF modules. Each module consists of a geotextile biofilter configured with alternating effluent feed channels and geotextile barriers where active biomass develops to filter and purify wastewater. The succession of feed and biofiltration cycles ensures the constant renewal of oxygen necessary to maintain optimal aerobic treatment.
The geotextile surface area provided in each module is very high, ensuring that pollutants are almost completely degraded and that minimal residue accumulates in the system. This gives ELJEN a very long service life.
Step 2
The second stage of the ELJEN GSF treatment takes place in a thin layer of filter sand at least 150 mm thick located under and on the sides of the modules. The effluent from the modules disperses laterally and vertically in the filter sand to quickly remove water from the modules and provide additional filtration treatment. The treated water then travels across the entire surface of the application area and percolates into the soil. The sand layer ensures that the treated effluent is dispersed and prevents localized hydraulic overload of the soil. This limits compaction and preserves the natural permeability of the soil throughout its lifetime. This maximizes the service life and reduces the risk of clogging.
Performances
Consistent, effective treatment, even in cold climates
Twelve-month trials, including 12 consecutive weeks at water temperatures below 10°C,
demonstrate that the system maintains stable effluent quality that complies with advanced treatment standards.
Unlike many cold-sensitive technologies,
ELJEN GSF retains its biological and hydraulic effectiveness throughout the year.
ELJEN GSF
Performance over 12 months
(including 12 consecutive weeks at a temperature below 10°C)
DBO₅C (mg/L)
Suspended solids
(mg/L)
Fecal coliforms (CFU/100ml)
Average
2.0
2.7
66*
Average
(water < 10°C)
1.2
1.7
13*
Median
1.0
2.5
71*
Minimum value
1.0
2.5
2*
Maximum value
7.2
7.0
10 965*
* Geometric mean
Specifications
ELJEN GSF passive biofiltration modules are integrated into the wastewater dispersion field and combine two treatment stages to produce high-quality effluent that meets the most stringent standards.
Pollutants are reduced through biofiltration treatment in the ELJEN GSF modules and then in a thin layer of filter sand located on the sides and underneath the ELJEN modules. The treated water is then discharged either through infiltration into the natural soil directly surrounding the modules.
In large commercial applications, ELJEN GSF modules are distributed across one or more infiltration cells, and we distribute the effluent to be treated evenly across the modules using our gravity or pressure wastewater distribution technologies, depending on the project requirements.
A septic solution for life
With a lifespan of over 20 years, ELJEN will undoubtedly be your last septic system ever. At the end of its life, ELJEN will have preserved your soil properties intact, and only the modules will need to be replaced.
This makes it an economical and permanent solution.
Restriction*
ELJEN GSF modules are distributed for residential and commercial projects in Ontario, Manitoba, and the Maritimes.
In Quebec, the modules are available for commercial use only
(minimum flow rate of 3,240 liters/day).
Your questions, our answers
What is an ELJEN GSF system?
The ELJEN GSF is a wastewater treatment system for properties without access to a municipal sewer system. It uses a combination of biofiltration and filter sand to purify water naturally, without complex mechanical parts.
Why choose ELJEN?
Because it is simple, durable, and economical. It protects the soil, requires little maintenance, operates without electricity, and provides higher-quality effluent than traditional fields, reducing the risk of future problems.
Does ELJEN replace a septic tank?
No. It works in conjunction with the septic tank. The tank pre-treats the wastewater, and the Eljen GSF performs advanced filtration, improving the quality of the effluent before it infiltrates into the soil.
What is the lifespan of the system?
The system structure can last more than 20 years. Only the modules need to be replaced at the end of their service life, which avoids having to completely rebuild the treatment field and reduces long-term costs.
Does ELJEN work well in winter?
Yes. The ELJEN system has been tested in cold conditions and maintains excellent performance even when the water temperature drops below 10°C. Since it does not use any mechanical or electrical parts that are sensitive to freezing, it remains reliable all year round and does not require any special winter protection.