Sparging signifies the injection of air into the groundwater of the aquifer. The air migrates in fine fissures to the vadose zone. The air injection leads to a stripping of contaminants into the vadose zone and boosts aerobic biodegradation in the groundwater. Contaminated vapour is extracted and treated. Benefit is low energy consumption during operating. The technology is applicable for monoaromatic hydrocarbons, petroleum hydrocarbons and VCHC.