I have some of that too, but I guess you arent suppose to add it to water that may have chlorine in it, so I havent started him on it yet. We use tap water that runs thru a filter. I need to read up on this aspect of silver. I think some kind of reaction can take place, I try to store water here and there and use old milk cartoons. I added some silver once and the cartoons had some sort of chemical reaction take place on the inside... it convinced me.