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Gross Pollutant Trap


MAK Water’s Clearmake™ Gross Pollutant Trap (GPT) treats rain and storm water runoff from hardstand or car park areas. The GPT protects the storm water system and the surrounding environment from contaminants such as silt, hydrocarbons, and other debris that can accumulate and be washed off of hardstand and car park areas.

MAK Water’s Clearmake™ GPTs are a cost effective alternative to larger concrete GPTs, which are more expensive to purchase and more time consuming to install. MAK Water Clearmake™ GPTs are compliant with local Council and Department of Environment and Heritage Protection (DEHP) requirements.


  • Storm water treatment for hardstand and car park areas.
  • Commonly used in townhouse and medium density housing applications, as well as small to medium commercial projects.

Urban Water Resources Centre of SA has prepared an independent performance evaluation of the Clearmake™ GPT, under controlled laboratory conditions.
The program assessed:

  • Hydraulic capacity
  • Collection and retention of sediment
  • Collection and retention of “free” oils

Effectiveness of unit during low flow and high flow regimes. Click here for a complete copy of the report.


Clearmake™ GPTs are a robust roto moulded plastic underground tank incorporating a silt tray with galvanised grate. Risers are available for the GPT to enable it to be installed at a variety of depths from the surface. The riser allows multiple inlets to be installed or for adjustment of drainage levels. The generous 500L tank treats a 400m2 hardstand (or up to 6L per second flow).

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