When bought the desiccant ,and there are some rest, how to keep the desiccant ? Dry sealed preservation is very important. Chunwang desiccant unopened and in its packaging in good condition without any damage to the case (sealed), the life of the desiccant could up to 18 months. Chunwang desiccant with very good moisture absorption capability ,once open the plastic bag in the carton , please use it out as soon as possible, unused reseale it please. For save the desiccant ,please avoid sunlight ,avoid damp .keep it in dry cool place. please take care the children, keep it away from them.