[oxymoran]

I have used a Netti pot style device with a very small amount of diluted hydrogen peroxide to treat sinus infections for years. At the recommendation of my doctor.

//sarcasm// But for treating covid that idea is preposterous.

[cassianoleal]

You probably already know this, but please don't use tap water directly, even filtered, into your nasal cavities as it carries risk of death [0].

> Sterile water, which is free of bacteria and viruses, is recommended for use in neti pots. Tap water can be used only if it has been passed through a special filter or boiled for three to five minutes, then left to cool until lukewarm. Most bottled “spring” water is not considered sterile, so it should not be used unless it is boiled first.

[0] https://www.nbcnews.com/health/health-news/careful-use-neti-...