Why calcium chloride or silica is placed in desiccatorswhy should it be dried occasionally?

Calcium chloride or silica gel is placed in desiccators to absorb any moisture present in the air, creating a dry environment for storing moisture-sensitive materials. These desiccants need to be dried occasionally because they reach a saturation point where they can no longer absorb moisture effectively, and drying them renews their moisture-absorbing capabilities for continued use.