Gross Pollutant Trap

The 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 GPTs are a cost-effective alternative to larger concrete GPTs, which are more expensive to purchase and more time consuming to install. Moulded from a selected grade of polyethylene, MAK Water Gross Pollutant Traps are light and easy to install. The external ribbed design provides support and strength to resist external forces from backfilling while reducing the risk of floatation.

The Gross Pollutant Trap unit utilises a triple action filtering process incorporating a positive baffled separation sump fitted with a tray to remove silt and sediment. The outlet pipe blister is 400mm wide with a multi-size boss and socket arrangement permitting pipes of varying sizes to be connected using rubber sleeves and stainless steel worm drive clips. This allows pipe cover of 300mm for 300NB and 225NB pipes and 330mm cover to the 150NB connection.

MAK Water GPT Risers can be used if the depth to the pipe needs to be greater. This simply drops into the rim of the pit and locks over the lip.