At the former fire training area of the Sundsvall‑Timrå Airport in Sweden, SourceStop® Liquid proved highly effective in reducing PFAS migration from a heavily contaminated source zone.

Up to 99.8% PFAS Reduction in Groundwater: Monitoring over 14 months confirmed consistent ∑32 PFAS reductions between 91.1% and 99.8%, validating rapid and durable treatment performance within the source zone.

Effective Plume Control: Downgradient wells up to 25 meters downstream showed 93–96% PFAS reductions as groundwater flowed through the SourceStop-treated area, demonstrating strong plume attenuation and protection of nearby surface water.

Sustainable, Low‑Impact Implementation: The treatment was installed using low‑pressure direct‑push injection across a 225 m² treatment grid, leaving no equipment onsite after completion and delivering a long‑term immobilization solution with minimal disruption.

Applied as a thin, in situ colloidal activated carbon (CAC) treatment, SourceStop rapidly immobilized PFAS in groundwater—achieving up to 99.8% reductions within the treatment zone.

This innovative project, led by the Geological Survey of Sweden (SGU) and the Swedish Geotechnical Institute (SGI), demonstrates how a sustainable and low‑impact CAC approach can protect downgradient receptors, including a nearby river, while delivering long‑term stability even through seasonal snowmelt.