Hello Tom, once again you amaze me. I'm humbled by your help.
You likely have already given somewhere specific instructions on making 5 percent. I do have sodium chlorite flakes but only instructions on 28 %. If you have a link to a previous post , great. If not I will do some searching you have given me so much already. Clearly the math is sketchy for me therefore your specific instructions are such a gift.
I just arrived home and will be able to make this up and try. I will keep you posted.