Sales phone 131 004

First Defense® Vortex Separator

The First Defense® vortex separator is a simple, robust device for removing sediment, floatables and associated pollutants from stormwater. Manufactured by Hydro International Ltd it is available from Rocla under exclusive license in Australia.

Pollutants are retained in the device; the advanced design prevents re-suspension and wash-out during high flows.  The First Defense® can remove over 95% of total suspended solids at the design treatment flowrate.

The First Defense® system is as easy and quick to install as a standard precast stormwater pit. The unit is delivered to site completely fabricated, ready to be installed into an excavated hole and connected to the stormwater.

The optional grated inlet and/ or up to two pipe inlets gives the First Defense® great flexibility for being installed at source (close to the pollution generation) and these are typically small catchments and mostly hardstand areas such as cark parks.


  • new developments
  • industrial sites
  • construction sites
  • car parks
  • streets and roadways
  • shopping centres
  • maintenance wash-down bays
  • wetland protection