Modern Water’s first full scale seawater plant (18 m3/day) was commissioned in Gibraltar in September 2008 at an AquaGib site (Figure 3), with water going into the public supply after extensive independent testing on the 1 May 2009. This was followed by a much larger plant (100 m3/day) located at the Public Authority for Electricity and Water’s site at Al Khaluf (Figure 4) in Oman in November 2009 [ 10]. In an open public tender for conventional reverse osmosis, Modern Water was awarded a turnkey contract to build a 200 m3/day forward osmosis based desalination plant at Al Najdah (Figure 5) again in Oman. Each of these plants has built upon the experience and development of the previous one, together with FO membrane development and work undertaken within the laboratory