In order to evaluate how far downstream the described hydrochemicalchanges occur in the Lower Vistula River, the water
was examined at the sites of Włocławek III (675 km), Nieszawa V (696 km) and Torun´ VI (736 km, see Fig. 1), during the seasons of 1994/95 and 1998/99. Standard methods were applied for hydrochemical analyses.