Drentel - It's natural to have doubts about new remedies and cures. There are so many new herbs and products hitting the market that a little skepticism is wise. However, given what we know about salt in general, there seems to be no great risk in using the Himalayan crystals in place of some of the ways we use salt now.
You don't have to suddenly start ingesting more salt because you think it is going to cure what ails you. Too much of any substance taken into your body is going to cause problems, even water.
To use your example obtained from the article, substitute the pink salt for the white salt you normally use to treat your sinuses and see whether you see or feel a difference.