Yeah, boiling for sure, or at least pastuerizing, after the tea has steeped in case of contamination from the tea itself, but then does that “turn off” whatever benefit the black tea supposedly has?
I am sorry, I wasn’t clear.
Apparently tap water has germs in it, so should be boiled (and cooled!) before using in a neti pot.
Since one already has to boil the water, one can make the neti pot water into tea at the same time as boiling the water.