Silver Used by NASA NASA researched 23 different methods of water purification and selected a silver system for the space shuttles. NASA, as well as half the world's airlines use silver filters to guard against water-borne diseases. There are many practical uses for Silver including Colloidal Silver as an all-natural antibacterial alternative. One Month Supply - Colloidal Silver 4 oz. Distributor Franda Vaughan Natures Business dot Com 808 E 11th.
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