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You can get sterile saline solutions for this purpose, in case you don't want "natural" seawater. Yes, too little (or too much) salt in the water will be painful.

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You can just dissolve a teaspoon of salt to half a litre of any warm fresh drinkable water (tapwater is fine if it’s even reasonably good quality). Should be hundreds of times cheaper than sterile solution :)

Please sterilise it first.

https://www.pbs.org/newshour/health/what-to-know-about-anoth...

Point taken.

> CDC officials, citing a 2021 survey, say about one-third of U.S. adults incorrectly think tap water was free of bacteria and other microorganisms. Nearly two-thirds say tap water could be safely used for rinsing their sinuses.

> The CDC recommends using boiled, sterile or distilled water.

Flesh eating bacteria? Yeah, no, thanks.

https://www.pbs.org/newshour/health/what-to-know-about-anoth...

I may be biased by the quality of tap water where I live. Pharmacies around here definitely advise just using warm tap water, although they do of course also sell more sterile stuff too.

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