[cassianoleal]

If you read the article you're trying to criticise, you'll find this right at the end:

> For nasal rinsing, the CDC recommends using boiled, sterile, or distilled water. "If tap water is used, it should be boiled for a minimum of 1 minute, or 3 minutes in elevations >1,980 meters, and cooled before use," the researchers write.

[jtbayly]

I’m well aware of what it says. I read it.

The point is that nobody uses tap water in their nose. They always do something to the tap water that changes it so dramatically that nobody would consider it tap water anymore. They use salt water, not tap water.

As such, these instructions don’t address them in their minds.