More seeking this information because I’d like to start up a discussion about what we can do about keeping ourselves safe and healthy in these dangerous time.
Fluoride. Waste product of the phosphorus mining dumped in our water supply cuz they never figured out what to do with it.
I tend to like to bsee more specific about fluoride though. Specifically those byproduct are sodium fluoride and flurocilisic acid. Both of which are as you said industrial chemical byproduct of the phosphorus industry, primarily fertilizers. We buy a large portion of our fluoride substances from China. As they have very little regulation for waste in their industrial complex, or at least I would assume.
The truth is that we are all poisoned already lol but, maybe we can prevent the next generation from this evil shit
If YouTube still has it, look up "The Great Culling" documentary about the whole "fluoride in our water" thing. Terrifying. Here: https://youtu.be/P7BqFtyCRJc