Nano Silver has also been positive to be used for purification of drinking water, unlike the conventional methods of silver salts like Silver Nitrate, etc.  Check out this page:  http://www.silverhydrogenperoxide.com/blog/nano-silver-hydrogen-peroxide-benefits-over-hydrogen-peroxide-with-silver-nitrate

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Nano Silver has also been positive to be used for purification of drinking water, unlike the conventional methods of silver salts like Silver Nitrate, etc. 
Check out this page: 

http://www.silverhydrogenperoxide.com/blog/nano-silver-hydrogen-peroxide-benefits-over-hydrogen-peroxide-with-silver-nitrate