I have kept parakeets all my life, and colloidal silver in their water was great for clearing out those mystery colds. It works as good as dr meds for sinus infections in people, but not at all on colds in people. I tried it on a rooster that came down with what i'm pretty sure was infectious coryzoa, and it was useless. even at human dose. For the parakeets, i spritzed 5-10 sprays into their water. Strong, but they don't really drink a lot of it all at once, anyway.
I am interested in the GSE too. I have read that for sick chickens you can use 2 drops on a bread cube per bird. I have not tried it yet, but it is supposed to be effective against bacteria, mold, fungal, etc. . I am interested in any "practical" knowledge, too. I think it would be a great alternative to vinigar in the water, maybe at whatever dilution that is used when using it for a veggie wash.... I wonder if this would make a good "egg wash" for those who wash their eggs?