| http://www.w3.org/ns/prov#value | - There is thus a need for a simple, inexpensive and widely available purification and disinfecting system for potable liquids, especially water, that is: effective against range of Gram positive and Gram negative bacteria, viruses and other microorganisms; safe and free from the side-effects caused by chemical disinfectants; cost-effective and affordable; simple to use and can be carried anywhere;
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