Flushing your sinuses is an entirely different ballgame than just getting the lower 5 mm of your nostrils slightly moist.
There is a very thin membrane in your sinuses that leads to your brain. Tap water can be contaminated with microbes that can pass this barrier and cause various brain infections, in addition to the chlorine and fluoride not being very good for your delicate sinus skin. Sealed distilled water on the other hand is sterile and pure.
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