If calcium chloride is stored in a way that allows it to come into contact with humid air, it may become caked. If the product is lightly caked, it can usually be broken up into a usable form by knocking the closed package against a hard surface, similar to breaking up a bag of ice from a convenience store. However, if the product is severely caked, this approach may not be effective. Using forceful hammering is not recommended, as flying chips of product could be hazardous, particularly to the eyes. If the caked product cannot be broken up into a usable form, it should be disposed of according to the guidance on the product label.