The MD unit arrived at the pilot plant the 5th September 2011. From 6th to 16th September the device was installed and the start-up was done successful. Now the unit is ready to provide quality water to the electrolyser.The device consists of two distillation membranes in series with 3 tanks (raw water, distilled water and product water). The raw water leaves the raw water tank and after passing through a UV module to disinfect the wastewater enters to the first MD-stage. Then the treated water is collected in the distilled tank before passing to the second MD-stage. After the second MD-phase the treated water is kept in the final product tank. The process works at temperatures around 70 ºC and the heat to work on the MD in obtained from four solar collector.