After reading a purportedly scientific paper comparing the risk of giardiasis to the risk of shark attack, I stopped treating all my water and promptly got giardia for the first time in 20+ years.
Having done a lot of research now I've found many major flaws in said paper. I'd be delighted if those of you with a scientific mind would read through my findings and tell me what needs to be changed to make it accurate, or why you think my conclusions are logical as written.
Thanks folks!