After a quick surf, calcium chloride used as dessicant is about 94% cacl2 and the rest is a binder. The binder is non-toxic and food grade, if not it will react with cacl2 and will destroy its properties, among others, as a dessicant The one used in Reefvideos.com, Dowflakes, is only 80% cacl2 and 20% binder. With the looks of it, it should be okay. Only thing left is to try it. But for peace of mind, I'd get this one from Alysson!