The hybrid constructed wetland systems (HCW) working in two different configurations were analysed. The HCW systems consist of at least two beds: vertical flow and horizontal flow. The first configuration, with the horizontal flow bed at the beginning (Fig. 1a), was analysed basing on two constructed wetlands located in northern Poland, in the Pommerania Province: in Wiklino and in Wieszyno. The second study system configuration, with the vertical flow bed located at the beginning of the treatment process (Fig. 1b), was the Wiedersberg plant in Saxony, Germany.