Death by neti pot: Why you shouldn't use tap water to clean your sinuses
Briefly

Just because something is safe to eat or drink doesn't mean it's safe to squirt deep inside your face, like your sinus cavities and eye sockets...
In a survey study published last year, researchers found that an alarming number of people in the US were completely misinformed about the safety of tap water for home medical uses.
Read at Ars Technica
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