Since the gel cycles via and becomes heated, the odors trapped during the gel could escape. Some desiccant dehumidifiers may have a laundry mode. You could run this periodically in an open up-air space to launch any trapped, uncomfortable odors. One of the more adaptable products on our checklist is https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/