@gigiv Thanks for posting. I learned something, so it's a good day! Guilty as charged as using sinus rinsing as a preventative measure. From the article you posted:

"Only use nasal irrigation when you need it

Start by performing just one irrigation a day. If the rinse is helping, you can irrigate your nose up to three times a day. But nasal rinses should not be used as a preventive measure when you don’t have symptoms. It won’t prevent sinus issues and can cause infections to develop.

Your sinuses and nasal passages are lined with good mucus — it traps the irritants and germs that enter your nostrils and can kill some bacteria. Regular flushing can hinder those protective features and increase the risk of infection."