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@Krauerking @PlasticExistence they'll have subtly different drying profiles. Silica gel had a higher capacity but will maintain a generally higher relative humidity. Check the graph here out https://www.impakcorporation.com/desiccants
Activated alumina doesn't appear to be as effective as molecular sieve at low humidity from a lit. search.

You should check for air leaks in the system first. When I lose Desiccant this is usually why.

P. S. Silica gel can be regenerated.