I saw a reference to this a week ago and went on a hunt. Found: https://jimhumble.co/ who has several e-books for sale, one of which describes in great detail how to make the stuff yourself. I was interested so I bought two books but haven't read them yet. I also make my own silver colloidal solution which has worked for me in warding off colds and other respiratory ills by just gargling with it. I asked an old friend who is a retired AF nurse about the chlorine dioxide and was told that there are many warning posts about its toxicity so one needs to do their own research. Thanks for the p