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I used the Sinus Rinse with tap water without boiling it?

Yes, it is extremely important to boil tap water for 5 minutes and let it cool before using it for nasal hygiene purposes. Tap water is generally safe to drink, but it may contain microorganisms that could be harmful when used for nasal hygiene. If you experience frequent or forceful nose blowing, it could potentially cause nosebleeds. It may be helpful to try blowing your nose more gently and irrigating with less force.