Nano Silver
Nano silver is used in everyday society to keep things clean and fresh. Nano silver is used in socks to keep them from not stinking as much. They also put in toothpaste to aid in plaque clean up! In my project we thought of putting nano silver inside casts to keep bacteria from growing inside the casts and so it does not itch or smell as much.
There are many ups and downs to using nano silver in everyday products. Nano silver is known to kill bacteria which means on top of killing the bad bacteria if it is washed into the environment it can kill some good bacteria in rivers as well. 
A way it could be washed into a river or the water system is if you’re washing your handy dandy nano socks in the washing machine and then the water with the nano silver in it will be drained into the water system. Another way is if you’re brushing your teeth and you spit the toothpaste into the sink those nano particles will wash down the drain as well.
A really cool thing about nano silver is you can put them on windows and the windows will clean themselves rather than you having to clean them. Also they are used in some refrigerators to keep them clean as well.
Nano silver is a very cool multi use appliance particle that you can put on things to keep them clean. In the future nano silver most probably be used in many more products to keep them clean for less maintenance per year.
http://www.ntbase.net/pic/050512_F4.jpg
http://img.alibaba.com/photo/10903452/Nano_Silver_Toothpaste.jpg
http://en.wikipedia.org/wiki/Silver_Nano
http://abcnews.go.com/images/Health/abc_Silver_Socks_081014_mn.jpg