Posted - 22 March 2022

Next-generation modular Downstream Defender Select unveiled

We are launching the new Downstream Defender® Select, a modular next-generation hydrodynamic separator optimised for the treatment of surface water runoff. 

Combining the industry-leading performance of the Downstream Defender® with a wide range of customisation options, the Downstream Defender® Select now enables engineers to tailor their drainage designs to meet specific pollutant removal objectives, such as the Simple Index Approach (SIA).

The modular nature of the system means that designers are able to select from a spectrum of configuration options to deliver site-specific treatment objectives, from simple betterment to advanced vortex separation with oil and floatables removal and retention enhancements.

Like its predecessor, the Downstream Defender® Select provides exceptional treatment performance, reliably capturing and retaining sediments, oils and hydrocarbons, litter and floatables from surface water runoff from roads, car parks or any impermeable area. The patented internal components ensure a streamlined flow path through the unit, enhancing its separation capabilities, and pollutants are retained in designated zones within the chamber, with options for enhanced retention of sediments and oils and hydrocarbons.

Design and installation is now made easier and more cost-effective, as the Downstream Defender® Select benefits from an extended range of chamber sizes, multiple connecting pipe sizes, and up to three inlets. This removes any need to factor in costly, complicated pipe connections, couplings or additional chambers.

For quick and straightforward installation, the Downstream Defender® Select is delivered pre-installed inside a concrete chamber so that, once positioned, it can be directly connected to pipework. For sites where access to heavy lifting equipment is difficult, the Downstream Defender® Select can also be supplied in a lightweight, easy-handling plastic chamber.

Hydro-Logic Smart Maintenance for Downstream Defender SelectIn addition, Hydro-Logic® Smart Maintenance technology can now be integrated into the system. This remote monitoring capability provides real-world insight into sediment and/or water levels, sending automated alerts to notify users of when the Downstream Defender® Select needs emptying or if a blockage occurs downstream. Data captured by the ATEX/IECEx-rated loggers and sensors also enable owners to forecast future maintenance requirements and develop cost-effective maintenance plans.

Building upon the foundational Downstream Defender® technology that is already protecting waterways across the UK, the Downstream Defender® Select has been tested in accordance with the British Water Code of Practice Assessment of Manufactured Treatment Devices Designed to Treat Surface Water Runoff, meaning that engineers can have full confidence in its performance, effectiveness and reliability.

To add further confidence and reduce risk, engineers can design the Downstream Defender® Select quickly and easily using Hydro International’s dedicated online design tool. A simple two-step process enables users to size and then refine their design for optimum performance with optional Smart Maintenance. The tool provides the option to create and save multiple designs, and its one-click data output feature makes project work simple and straightforward. Visit to create an account and start designing.

The Downstream Defender® Select is the most customisable product we have ever developed," said Ben Puddy, Regional Technical Manager for Hydro International, "It meets and exceeds all standards of the previous model and provides designers with almost limitless configurations to choose from, including performance levels, multiple inlets, pipe sizes, chamber sizes, chamber types and monitoring options. This allows designers to fine-tune and optimise their design to meet the specific needs of the site.

Design your Downstream Defender® Select online

Sign up for our Online Design Tool and design your modular Downstream Defender® Select quickly and easily online. 

Related News

  • Hydro-Brake® Optimum is now part of Site3D

    We’re excited to announce that the Hydro-Brake® Optimum flow control is now included in the Site3D civil engineering design software…

  • Florida DEP Accepts Downstream Defender for Water Quality

    The Florida Department of Environmental Protection has accepted the Downstream Defender® hydrodynamic separator to remove nutrients…

  • First Defense OGS Verified by ISO 14034 Standard

    First Defense® is the first stormwater separator to be verified through new ISO 14034 standard in Canada. The First Defense® oil…

  • Hydro-Brake Optimum design tool launched for US engineers

    Our new online tool makes it easy for engineers to design and specify customized flow control valves for US LID and flood protection…

  • Second Annual Trash Cleanup to be used in Study

    Our Portland, Maine team spent a day cleaning up the Long Creek Watershed, and will study the trash collected to improve the way we…

  • Up-Flo® Filter Certified by NJDEP under New Testing Protocol

    The Up-Flo® Filter has been recertified for 80% TSS removal by the NJDEP. The Up-Flo® Filter stormwater treatment system was recertified…

  • Up-Flo Filter NJCAT Verified

    The Up-Flo® Filter has been verified by NJCAT under a new stormwater treatment testing protocol. The Up-Flo® Filter stormwater treatment…

  • Tests demonstrate >75% stormwater pollution capture at busy commercial port

    Real-world testing in Pasaia, Spain demonstrated that Downstream Defender® and Up-Flo® Filter captured between 78% and 90% of pollution in…

  • Community cleanup will use trash for environmental research

    Hydro International volunteers clean up an impaired watershed, and will conduct environmental analysis on trash collected. Hydro…


Join our mailing list

We'll keep you updated about things like news articles, upcoming webinars and product developments.