Intro
French Vertical Flow constructed wetlands are the core engineering system behind wå-trädgård. Wastewater is dosed onto the surface of a planted filter bed and allowed to percolate vertically downward through layered media and root systems — mimicking, and accelerating, the way natural wetlands purify water. It’s the technology that lets us treat sewage and effluent without the tanks, blowers, and constant supervision a conventional plant demands.

How It Works
Wastewater is distributed evenly across the surface of the wetland cell → it flows vertically downward through the planted media bed → root systems and naturally occurring microbes break down organic matter and remove pollutants as the water percolates → clarified water is collected at the base and moved to the treated water tank for discharge or reuse.

Why Vertical Flow
Compared to horizontal-flow or purely surface-flow wetland designs, vertical flow beds:

• Achieve higher oxygen transfer through the unsaturated media, improving BOD/COD breakdown
• Treat higher pollutant loads in a smaller footprint
• Handle variable and tidal loads without upset
• Need minimal to no mechanical aeration, keeping energy use low

Performance
Our French Vertical Flow systems consistently deliver 90–98%+ removal of BOD, COD, TSS, and Nitrogen — verified across live installations from 5 KLD to 150 KLD.

Applications

• Apartments, villas, townships, colonies
• Hotels and resorts
• Hospitals
• Industries — dairy, cement, food processing, breweries
• Schools, colleges, universities
• Municipal wastewater

Proven Installations

• MNNIT Prayagraj — 50 KLD
• Dwarika Residency, Jhansi — 100 KLD
• YTT Housing Society, Lucknow — 100 KLD
• Sukhriti Enclave, Rudrapur — 150 KLD
• Amaghati Resort, Ranthambore — 11 units, 5–10 KLD each

Curious whether a French Vertical Flow wetland fits your site? Talk to our team about a free assessment.
+91 98709 79186 / +91 82734 95858 | info@watwagroup.com