As being the gel cycles through and gets heated, the odors trapped during the gel may escape. Some desiccant dehumidifiers may need a laundry method. You can run this periodically in an open-air area to launch any trapped, disagreeable odors. They absorb excess humidity in the atmosphere by extracting water https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/