An excerpt from Wikipedia for you: "Currently, colloidal silver is marketed as an alternative medical remedy, though there is no scientific evidence of its effectiveness for any medical condition.[1][2] Excessive use can result in argyria, a form of silver toxicity."

Read more at Wikipedia or another reference, if you wish to do so. I'll stick with silver threads woven into my non-stink clothing to take advantage of silver's antimicrobial properties. Emergency rooms use a preparation called "Silvadene" on some burns. I figure there is a reason that is is available only by prescription. Chalk up using colloidal silver for water treatment next to using grapefruit seed extract (GSE) for the same purpose. No thanks!

CamperMom