In this work, two types of pilot constructed wetlands were used to treat drainage water from the hydroponics farm in the Jordan Valley. Zeotuff was used as wetland filtering media. The wetlands were planted with giant reeds ( Arundo donax L.). The performance of the wetland systems under varying hydraulic retention times (HRT) was investigated in terms of BOD, COD, NO 3 , PO 4 , cations, anions, TSS, salinity and water conserv...