ABSTRACT
A gradual decrease in infiltration rates has been seen over a period of decades in infiltration ponds in Sweden. This indicates that long-term clogging is taking place below infiltration ponds. In addition some surface waters used for artificial groundwater recharge contain low-degradable anthropogenic pollutants. For a sustainable drinking water production, in line with Agenda 21, these compounds, undesired in the subsurface and groundwater need to be removed in the initial stage of infiltration, i.e. in the filtersand. To attain knowledge about how to reach these goals, further research into the mechanisms involved in the retention and transport of various compounds through porous media is crucial.
