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in reply to Re^2: I usually boil water for tea using a(n) ...
in thread I usually boil water for tea using a(n) ...

I have also used citric acid several times. It can be bought here for cheap (I am not sure what its original purpose is) and its aftertaste is much less noxious.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ