Why shouldn’t you rinse your nose with tap water even though it gets in your body when you shower?

Question

I’ve seen that you should buy distilled water to rinse your nose with, but I probably get regular water in my eyes and nose when I shower anyways wouldn’t it be dangerous while showering also?

In: Biology

Answer 1

German here: No one would use distilled water to rinse your nose. No doctor would ask you not to use tap water. Crazy.
All that is important to us is the saline level.