Holcim - Next Generation GTP
February 2026
Bringing the Next Generation Pollutant Trap to Life with Holcim
Smarter stormwater protection: how the next generation HumeGard is improving pollutant capture, reducing maintenance, and making cleaning faster and safer for modern developments.
Holcim have developed a new generation of the HumeGard which has been a cornerstone of gross pollutant traps (GPTs) since the early 2000s. HumeGard came out of a push by Jeff Kennet in the 90s to reduce the quantity of rubbish and sediment deposited in the Yarra during storm events. Hume teamed up with Swinburne University and the gross pollutant trap (GPT) was born. It started off with 5, and then another 5, and now they are used standard practice wherever urban waterway pollution is an issue, and in new developments in Australia and overseas.
Shadforth were able to offer Holcim an area where they could carry out independent testing as part of the Stormwater Quality Improvement Device Evaluation Protocol (SQUIDEP). This gave us the opportunity to discuss the improvements with the designer of the system Dr Charles Kelly (Humes National Manager – Water Solutions). The new design will result in:
Improved pollutant capture through an enhanced final membrane that allows captured pollutants to settle at the bottom of the trap after storm events.
Reduced maintenance through removal of any moving parts
Reduced time required for cleaning using an integrated flushing system that can operate from connecting the high-pressure water hose without having to lift the top off the trap.
