Different types of desiccant dehumidifiers do the job in alternative ways, but the key approach they use to extract humidity from your air is either absorption or adsorption. Absorption takes place if the desiccant material dissolves as it's going to take moisture through the air, as is the situation with https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/