Differing kinds of desiccant dehumidifiers perform in different ways, but the principle method they use to extract dampness with the air is possibly absorption or adsorption. Absorption takes place if the desiccant compound dissolves as it will take moisture from your air, as is the situation with moisture absorbers. Probably https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/