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The problem is that in many developing countries, chlorine is imported, rather than produced locally. This increases the price tremendously as it adds transportation, storage, and other related costs. Often also the source and transportation is not reliable in certain remote areas. The WATAsol devices, developed by [http://www.antenna.ch/en/drinking-water.html Antenna Technologies] allow chlorine to be produced locally, on different scales to provide chlorine disinfectants for individual households, health centres and hospitals, and emergency relief.