Depending on the climate where you live, you may find that your Celtic Sea Salt® can retain some moisture. The salt is so raw and natural that it takes in moisture but also needs to be able to release it. Be sure to store your salt in a breathable container, preferably the ones sold at Selina Naturally®: salt-containers.
The simplest method for drying out your salt is spreading it out on a dish and placing it by a sunny window. You may also store your Celtic Sea Salt® in its original bag, loosely sealed. Try placing your bagged salt in the freezer for 12 hours to freeze-dry the outer edges of the crystals. You can even put your grinder in the freezer, with the salt inside it, but please remember to remove the grinder top from the glass bottom before doing so. Also try spreading the salt out on a ceramic dish and set it in a warm oven, that is turned off, and let the dish sit there until you are satisfied with the dryness. A low temperature under 250° F will not alter the mineral balance in the salt!