There are about 30 currant- and sultana;finishing plants in Greece. Methods of washing-water use and wastewater treatment and analysis are described. A ease study of currant-wastewater treatment is analysed. Chemical coagulation, acidification, methanization, extended aeration, evapotranspiration are used. Advanced oxidation of treated effluent using physicochemical processes was applied to decrease COD and colour to values appropriate for irrigation and underground aquifer recharge.