Quote Originally Posted by Ian Grant View Post
Distilled water is no better than De-ionised for photographic use and in most areas tap water's OK as well, - there's really only issues in hard water areas.

Anyone who's mixing XTOL stock using soft tap water of unknown iron content is asking for trouble. Mix XTOL stock using distilled (not "de-ionised," but "prepared using steam distillation") water. Store it in full glass bottles. Enjoy the benefits. See: