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Gross Pollutant Traps

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Growing environmental awareness has seen a change in the nature of development. Recent legislation has directed engineering design towards environmental protection, and often local and state governments require developments to include environmental protection devices.

To accommodate government requirements for stormwater treatment, the Aglass Gross Pollutant Traps have been designed to reduce oil and silt levels in stormwater systems.


The AGLASS Gross Pollutant Trap has been specifically designed for the in-line removal of Oil and Silt in Stormwater run-off from roads and both residential and industrial buildings, and can also be implemented in any situation requiring the removal of Oil and Silt from stormwater flows.

The AGLASS Gross Pollutant Trap can be installed in new or existing stormwater systems, and can be used for arresting Oil and Silt and any other settlable solids.


There are many benefits to the AGLASS Gross Pollutant Trap, including but not limited to:

  • The durable yet light-weight construction allows easy installation in a variety of places.
  • The design allows for highly effective removal of Silt and Oil with minimal maintenance.
  • The range accommodates pipe sizes up to 600mm in diameter, and flow rates up to 798 L/s, allowing specific selection for most design criteria, and treatment of up to 95% of annual stormwater runoff.
  • A choice of lid options to suit all loading requirements.
  • The economical and environmentally sound stormwater treatment solution.


  • Range from 150mm inlets to 600mm inlets.
  • Three sizes available:
  • Gross Pollutant Trap 5 (GPT-5)
  • Gross Pollutant Trap 10 (GPT-10)
  • Gross Pollutant Trap 25 (GPT-25) – see brochures


  • Heavy Duty Fibreglass

Installation: Is to be installed below ground. (Can be installed above ground in some circumstances)

Lid Options:

  • Heavy Duty Class D – Trucks, Semi Trailers and Forklifts

Examples of Uses:

  • To reduce Oil and Silt Levels in Stormwater Systems.
  • Large factory water run-off areas.
  • Large carparks.
  • Large roof run-off.
  • Can be installed in roads to stop floating debris – cans, oil etc going through the waterways.
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