Please notice, this is silica cat litter. Not the rocks!!! This is the same trick we use in electronics equipment. Called “silica gel packs” in our business, it insures removal of humidity in packaging to insure no dew problems in electronics equipment. Once saturated, we would put these packs in an oven to dry them out and re-use them. I do not know if you can do the same thing with this cat litter, however.