How It Works & Products
Is my constructed wetland system a lagooning system? What is the difference between the two?
Constructed wetlands encompass several wastewater treatment methods that use plants and bacteria to treat wastewater. Constructed wetlands are one such method, but they rely on open water basins without substrate and require large areas to be effective.
Our system is based on this principle, but it is more compact. The basins are filled with substrate, which provides a support for bacteria and significantly increases their presence. The result: more efficient treatment in a much smaller area.
In summary:
• Constructed wetlands = extensive phytoremediation, large open-water ponds.
• Our solution = compact phytoremediation, with substrate to maximize bacterial activity.
Our system is based on this principle, but it is more compact. The basins are filled with substrate, which provides a support for bacteria and significantly increases their presence. The result: more efficient treatment in a much smaller area.
In summary:
• Constructed wetlands = extensive phytoremediation, large open-water ponds.
• Our solution = compact phytoremediation, with substrate to maximize bacterial activity.
Does my PhytoSTEP system work in the winter?
Yes, exactly. Even though plants are less active in winter, the bacteria in the filter continue to work and ensure effective treatment all year round. In fact, constructed wetlands are even more effective in winter than small-scale treatment plants.
Does a constructed wetland system produce odors?
No, no odors are emitted from your treatment system. Unlike small-scale treatment plants that inject air and pressurize the sludge—which can cause odorous gases—construction pond systems operate by gravity, without aeration.
The gravel bed creates a natural barrier that prevents odors from rising.
The anaerobic zones responsible for odors are confined to the pretreatment stage, but since no air is injected, no odors escape.
The anaerobic zones responsible for odors are confined to the pretreatment stage, but since no air is injected, no odors escape.
Where does your kit come from? Where is it made?
Our kit is entirely Belgian. We design our own tanks and oversee the entire production process. We work with local suppliers in Flanders and Wallonia, which allows us to guarantee the quality of our materials, maintain a short supply chain, and uphold the environmental values that are central to our business.
What happens if I'm away for a long time or if my usage varies?
A constructed wetland system handles periods of inactivity very well. It can remain inactive for six months to a year without any problems. Thanks to residual moisture and naturally occurring water (rain, condensation), the plants survive and the bacteria simply go into a dormant state. As soon as the system receives wastewater again, biological activity gradually resumes and the pond returns to normal operation.
Should I change the way I use household cleaning products?
Our system is designed to withstand the use of standard everyday cleaning products. No drastic changes are necessary, but moderate use is still recommended. In short: you can continue with your usual routine, while taking a sensible approach to maintain the pond’s balance.
Does it attract flies or mosquitoes?
No, the system is not conducive to pests. The water does not stagnate and remains about 5 to 7 cm below the surface of the substrate. It is therefore inaccessible to mosquitoes and flies, which do not have the environment they need to thrive.
Do plants need a lot of light?
PhytoSTEP ponds are primarily planted with Phragmites australis reeds. They thrive in light but do not require constant sunlight. Partial sun throughout the day is sufficient.
They grow very well in partial shade, even near a wooded area. If the area is very shaded, light pruning can be done.
They grow very well in partial shade, even near a wooded area. If the area is very shaded, light pruning can be done.
Can I keep my septic tank for a constructed wetland system?
Yes, that’s possible if it’s in good condition. During the feasibility assessment, we require that a professional have the septic tank pumped out to inspect its condition. If everything is in order, it can be kept and incorporated into the system.
Customer Journey & Setup
What are the steps involved in my sewer system project?
It all starts with a phone call to understand your project. We then schedule a free feasibility visit to assess your site (slope, soil, dimensions, etc.) and determine the best solution. You will then receive a quote, and you’re free to choose your own contractor, select one from our network, or opt for a DIY installation: our kit is designed for easy installation.
After installation, we return within 24 hours to verify that the system is working properly and to affix the certification plaque. We also assist you with all administrative procedures (SPGE, grants, inspections) as well as maintenance. Ultimately, you get a sustainable solution for the next 30 to 40 years.
After installation, we return within 24 hours to verify that the system is working properly and to affix the certification plaque. We also assist you with all administrative procedures (SPGE, grants, inspections) as well as maintenance. Ultimately, you get a sustainable solution for the next 30 to 40 years.
What is the purpose of the feasibility visit? What is checked during the visit?
This site visit allows us to confirm that your project can be implemented under optimal conditions. We analyze the technical parameters of the site (slope, available space, soil type) and verify the discharge point, sizing, and integration of the entire system: pretreatment, treatment, and discharge.
The goal is to ensure an effective solution that is well integrated into your overall water management system.
The goal is to ensure an effective solution that is well integrated into your overall water management system.
Who installs my PhytoSTEP system? Can I install it myself?
The choice is yours. Your contractor can install the kit using our detailed guide. If you don’t have one, we can recommend one from our PhytoSTEP network.
And if you prefer to build it yourself, our kit is designed to be assembled like Lego, is lightweight to carry, and very easy to put together. We can also assist you during key steps.
And if you prefer to build it yourself, our kit is designed to be assembled like Lego, is lightweight to carry, and very easy to put together. We can also assist you during key steps.
How much space should be allocated for a plant station?
The required area depends on the system’s capacity—specifically, the number of population equivalents (PE) in your home—and the type of wastewater to be treated (greywater or all wastewater). This estimate is customized and determined during our phone conversation or feasibility visit.
As a general guideline: approximately 2 m² per PE for greywater and 5 m² per PE for domestic wastewater in a horizontal system.
As a general guideline: approximately 2 m² per PE for greywater and 5 m² per PE for domestic wastewater in a horizontal system.
Does the ground need to be sloped for the system to work?
Absolutely not; a slope isn't necessary. With a slight incline, the system operates by gravity. Otherwise, a lift pump can ensure proper drainage.
Do I need to perform a percolation test before installing my constructed wetland system?
Not necessarily. If the chosen outlet is a leaching system, a test is essential to properly size the constructed wetland. PhytoSTEP can perform this test for you.
However, we will also verify whether infiltration is truly the best option or if a simpler solution (collection tank, discharge into a watercourse, etc.) is possible.
However, we will also verify whether infiltration is truly the best option or if a simpler solution (collection tank, discharge into a watercourse, etc.) is possible.
Maintenance
How do I maintain my constructed wetland system?
Constructed wetlands require very little maintenance because they operate without electricity or mechanical parts.
An official inspection must be performed every 18 months by an SPGE-certified service provider. This inspection—which is largely reimbursed—verifies that the system is functioning properly, analyzes the water, and measures the sludge level. The report is then sent to the customer and the SPGE.
Emptying is less frequent than for micro-treatment plants: every 4 to 10 years on average. The SIGPAA platform automatically notifies you when it is necessary, and the costs are covered by the SPGE.
Finally, a simple annual mowing of the plants is sufficient; you can do it yourself or we can take care of it if you wish.
An official inspection must be performed every 18 months by an SPGE-certified service provider. This inspection—which is largely reimbursed—verifies that the system is functioning properly, analyzes the water, and measures the sludge level. The report is then sent to the customer and the SPGE.
Emptying is less frequent than for micro-treatment plants: every 4 to 10 years on average. The SIGPAA platform automatically notifies you when it is necessary, and the costs are covered by the SPGE.
Finally, a simple annual mowing of the plants is sufficient; you can do it yourself or we can take care of it if you wish.
How do I maintain my constructed wetland system?
Yes, that is one of the major advantages of constructed wetlands. The treated water can be used for watering plants or outdoor cleaning.
Our system facilitates the recovery of treated water for two reasons:
- First, constructed wetlands provide significantly higher water quality than traditional systems
- Second, its surface design makes it easy to redirect the water at the end of treatment to a collection point or a reservoir designed for this purpose.
Reusing your water means reducing your consumption, taking an eco-friendly step, and lowering your costs.
Our system facilitates the recovery of treated water for two reasons:
- First, constructed wetlands provide significantly higher water quality than traditional systems
- Second, its surface design makes it easy to redirect the water at the end of treatment to a collection point or a reservoir designed for this purpose.
Reusing your water means reducing your consumption, taking an eco-friendly step, and lowering your costs.
When should you prune the reeds?
The cutting season runs from November 15 to early March. It’s best to cut them before the end of winter, as the stems are easier to mow while they’re still standing. Once they’ve fallen over, the task becomes more difficult.
What is the lifespan of a constructed wetland system?
It is estimated that a system remains fully effective for at least 35 to 40 years before any potential clogging occurs. However, our kit is made from durable materials, which generally allow it to last longer than that.
Should plants be replaced over time?
No, there is no need to plant them. The reeds used are perennials that naturally replenish themselves over the years.
Legal Framework & Standards
What is a population equivalent (PE), and how do you determine the size of a treatment facility?
Sizing is a key step in the feasibility study. It is based on an overall view of the project and takes into account the pollution load, the discharge standards that must be met, and the number of population equivalents (PE).
One PE corresponds to the average amount of pollution produced daily by one person. This figure serves as a reference for determining the size of the system required for proper wastewater treatment. The higher the number of PEs, the larger the treatment tank must be.
For example: if a house can accommodate 7 people but currently has only 2, the system is generally sized for an intermediate value—in this case, approximately 5 PE—to account for future use.
One PE corresponds to the average amount of pollution produced daily by one person. This figure serves as a reference for determining the size of the system required for proper wastewater treatment. The higher the number of PEs, the larger the treatment tank must be.
For example: if a house can accommodate 7 people but currently has only 2, the system is generally sized for an intermediate value—in this case, approximately 5 PE—to account for future use.
What does the PhytoSTEP certification entail?
Notre kit toutes eaux a été validé par un comité d’experts de la SPGE. Cet agrément certifie la qualité, la robustesse et l’efficacité de notre filière, et vous ouvre l’accès à certaines primes.
La SPGE valorise d’ailleurs les systèmes extensifs comme le nôtre en accordant une prime plus élevée que pour les solutions classiques, grâce à leurs performances supérieures et à leur grande fiabilité.
La SPGE valorise d’ailleurs les systèmes extensifs comme le nôtre en accordant une prime plus élevée que pour les solutions classiques, grâce à leurs performances supérieures et à leur grande fiabilité.
Puis-je mélanger mes eaux grises avec les eaux de pluie ?
Non, vous ne pouvez apas. L’eau de pluie, surtout lors de fortes averses, pourrait traverser le système trop rapidement et « rincer » le filtre. Le temps de traitement ne serait alors plus suffisant, ce qui nuirait à la qualité de l’épuration.
What requirements must you meet to install your wastewater treatment system in an area with an independent wastewater treatment system?
According to wallonie.be, the installation of a septic system is mandatory in areas designated for on-site wastewater treatment when:
• the dwelling was built after the plan (PCGE or PASH) classifying the area as requiring on-site wastewater treatment;
• work requiring a permit increases the dwelling’s pollution load;
• the building is located in an environmentally sensitive priority zone;
• the municipality requires an on-site wastewater treatment system to address a sanitation or pollution issue.
• the dwelling was built after the plan (PCGE or PASH) classifying the area as requiring on-site wastewater treatment;
• work requiring a permit increases the dwelling’s pollution load;
• the building is located in an environmentally sensitive priority zone;
• the municipality requires an on-site wastewater treatment system to address a sanitation or pollution issue.
What is the GPAA, and what is it used for?
GPAA stands for Public Management of On-Site Wastewater Treatment in Belgium.
This public service is responsible for monitoring, regulating, and supporting on-site wastewater treatment systems (such as constructed wetlands) to ensure their compliance and proper operation. In particular, it reviews projects and their implementation and provides ongoing monitoring.
What is PASH?
The PASH is the plan that outlines how wastewater is to be treated in each sub-watershed in Wallonia. It serves as a guide for determining where connection to a public sewer system is required, where individual wastewater treatment is permitted, and how priorities are set regarding infrastructure and water management.
What is SPGE?
The SPGE, or Société Publique de Gestion de l’Eau, is the Walloon agency responsible for organizing and overseeing water management. Its activities include wastewater treatment, the protection of water resources, and the financing of water infrastructure, whether public or private. Its role is to ensure sustainable and consistent water management throughout the region.
Wastewater treatment solutions using phytoremediation: simple, effective, and 100% Belgian.
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