Hydro Biofilter™ combines the simplicity of SuDS with the sophistication of smart engineering in a biofiltration system that uses soil and engineered filter media to treat an assortment of coarse, fine and dissolved pollutants from surface water runoff, even during high flows. 

Optimised for high volume flow while retaining high stormwater pollutant removal efficiencies, Hydro Biofilter™ can remove trash and coarse debris down to particulate and dissolved metals and nutrients in one compact and aesthetically pleasing treatment system.

Designed with versatility and ease of use in mind, Hydro Biofilter™ is simple to install and maintain and works well with a variety of conditions at residential, commercial and other developed sites. 

Targeted Pollutants

  • Very fine particles
  • Trash and floatables
  • Dissolved, liquid and sediment bound hydrocarbons
  • Sediment bound heavy metals
  • Sediment bound nutrients
  • Dissolved pollutants


  • Sustainable drainage systems (SuDS) and green infrastructure developments
  • Pollutant hotspots such as maintenance yards, car parks, petrol stations, streets, roads, airports and transportation hubs
  • New construction or redevelopment of commercial and residential sites
  • Areas requiring removal of coarse, fine or dissolved metals, oils, and nutrients

Hydro Biofilter™  is only available in the UK and Ireland

Hydro Biofilter™ was previously marketed as Hydro BioCell

Designed for

Oils & hydrocarbons
Very fine particles


Remove high levels of pollutants

Natural and engineered filtration technology, combining soil and filter media, removes a variety of surface water pollutants for a high level of treatment.

Save site space

Hydro Biofilter™ contributes to attractive urban areas and street scenes and supports local biodiversity. Its compact design makes it ideal for both new build and retrofit applications and can handle a high flow through a small footprint.

Cut maintenance costs

Maintenance is safe and easy and can be carried out from the surface using standard landscaping tools. No confined space entry is required.

We can provide full inspection and maintenance services. To find out more, call us on +44 (0)1275 878371 or email: sudsservices@hydro-int.com 

Reduce installation time

While the chemical and biological processes behind Hydro Biofilter™ are complex, installation is simple. The filter media and ready-fitted internal components are pre-packaged in the concrete chamber to facilitate easy drop-in-place construction.

Design with flexibility

Treated stormwater is discharged via the under drain system to a drainage outflow, watercourse, or onwards for infiltration if soil conditions allow. It can also be integrated with a secondary attenuation or infiltration such as the Stormcell® or Stormbloc Optimum® storage systems.

How it works

How it works

  1. Contaminated surface water runoff drains from the impermeable surface through the kerb inlet slots incorporated into the Hydro Biofilter™ cover slab or through an inlet pipe on to the mulch layer, where energy dissipater stones are applied to prevent erosion of the mulch and engineered media.
  2. The runoff then flows through the mulch and media layers where pollutants are captured and immobilised.
  3. Treated water is collected in an underdrain carrier pipe, which exits the chamber via a standard pipe coupler cast in to the wall of the chamber.

Treatment Processes

  • Sedimentation
  • Inert filtration
  • Reactive filtration
  • Media recharge


Technical information

Technical information

Unit sizes

  • 1.2 x 1.2 m
  • 1.2 x 1.8 m
  • 1.2 x 2.4 m

Filter surface area

  • 1.44-2.88 m2

Drained area

  • 480-1,440 m2

Outlet flow rate

  • 1.0-2.0 l/s


> Download the UK Guide to Designing the Hydro Biofilter

> Request a UK 3D model of the Hydro Biofilter™ for use with UK Building Information Modelling (BIM)




Case Studies

Case Studies