"The best salt on Earth." Contains the same trace minerals as the bodies, so it is easily metabolized. For finer salt, tighten the top metal screw. For courser salt, loosen the top screw. To Refill: Remove the top metal screw and lid. Refill with Himalayan Crystal Salt, available in 18 bulk packs from the Natural Foods Retailer. Replace lid and tighten top screw. Test for coarseness and tighten more if a finer salt is desired. not Dishwasher Safe! If needed, clean with damp cloth.