Stormwater treatment

Manage runoff and capture stormwater pollutants to comply with regulations and reduce damage to the environment.

Climate change and urban growth have created more frequent and more intense storm events, and greater areas of impermeable and impervious surfaces. When rain falls on the built environment it generates surface water runoff, which, if not controlled, can cause surface or sewer flooding. The runoff can also pick up a range of pollutants, including oils, heavy metals, nutrients and silt. When this storm water runoff reaches a storm drain or sewer it transports any pollution into the network, which may discharge directly or indirectly into the environment.

Our flow control products control, store and infiltrate surface water, while our stormwater treatment products catch and retain stormwater runoff pollution before it reaches the environment, preventing damage to fragile and important ecosystems. Often referred to as stormwater best management practices (BMP), they support effective stormwater pollution prevention plans (SWPPP).

Solutions are designed for low-impact development (LID), sustainable drainage systems (SuDS) and water-sensitive urban design (WSUD) projects. 

Stormwater treatment products


Hydrodynamic separators use vortex forces to separate pollutants from surface water runoff, settling out total suspended solids (TSS), biochemical oxygen demand (BOD) and solid-bound heavy metals and nutrients, while oils and floatables are captured at the surface.

Downstream Defender®

  • An advanced hydrodynamic vortex separator that provides impressive and reliable removals of sediments, oil and floatables from stormwater runoff. View product

First Defense®

  • A versatile separator that works with single and multiple inlet pipes and inlet grates. View product


Filters use the physical and chemical properties of custom filtration media to capture a wide range of pollutants from surface water runoff.

Up-Flo® Filter

  • An advanced stormwater treatment system that combines sedimentation and screening with filtration to capture sediment, oils, heavy metals and nutrients from surface water runoff, achieving TSS removal rates of up to 98%. View product

Hydro BioFilterTM

  • A biofiltration system that uses soil and filter media to treat an assortment of coarse, fine and dissolved pollutants from surface runoff, even during high flows. View product

Flow control products

Hydro-Brake® flow controls

Hydro-Brake® flow controls have deservedly earned a reputation for delivering reliable, effective drainage control, stormwater management and flood protection. Requiring no power and with few or no moving parts, they provide exceptional water management for sustainable drainage (SuDS), low-impact development (LID) and water-sensitive urban design (WSUD) projects.

Hydro-Brake® Optimum 

  • A vortex flow control custom-engineered to provide site-specific water management for surface, foul and combined water across a wide range of flows and for a variety of applications. View product

Hydro-Brake® Flood 

  • A vortex flow control providing large-scale protection at the watercourse level to prevent costly damage and disruption to residents, businesses and essential services. View product

Hydro-Brake® Agile 

  • A float-activated flow control providing constant discharge, cutting on-site storage to a minimum while matching the carrying capacity of downstream infrastructure. View product

Hydro-Brake® Orifice 

  • A low-cost, low-complexity flow control for surface, foul or combined water at sites with generous discharge consents and low storage constraints. View product


Modular storage blocks provide below-ground storage for stormwater and surface water runoff, increasing drainage capacity and allowing managed infiltration of water back into the environment.

Stormbloc® Optimum

  • A modular geocellular structure that provides effective below-ground storage and infiltration of stormwater and surface water. Units are lightweight, quick to install and "nest" to save space, time and money. View product


  • Below-ground storage and infiltration of stormwater and surface water. View product


  • A high-capacity, low-maintenance modular stormwater and surface water storage system that suits shallow, deep or irregular sites. View product

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