Differing kinds of desiccant dehumidifiers do the job in alternative ways, but the principle method they use to extract moisture from the air is either absorption or adsorption. Absorption takes place if the desiccant substance dissolves as it requires moisture within the air, as is the situation with moisture absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/