The injection of free chlorine gas in the main potable water trunk is one of the traditional sterilisation techniques that was adopted in order to ensure the disinfections of the MSF distillate before delivering into the potable water network in the United Arab Emirates. This secondary disinfections technique has become more difficult and un-economical both due to the difficulty and costs in the procurement of free chlorine gas in bottles and for the complications required to ensure that the safety aspects related to the use of chlorine gas is properly handled. These require an abatement system with absorption towers and deluge system to be commissioned for safety reasons at six month intervals. The alternative to the injection of free chlorine gas was the sterilization by mean of chlorine generated by seawater electrolysis. In reality the actual seawater electrolysis techniques allow an active Cl-2 concentration of maximum 2000 ppm. The problem with these sterilization techniques as well as with the practice of blending seawater with potable water for the increase of Total Dissolved Solids which is required to maintain the characteristics of palatability of the potable water produced by thermal desalination is the possible transportation of contaminants present in seawater in the potable water via the sterilization technique. The plant has been installed in the Al Taweelah site for the treatment of the product water up to 97 MIGD.