Clay Pigeon
Shooter
A Golden Rod and similar devices are not a "dehumidifier".... they are simply a heat source that causes a tiny temperature rise in your safe. By raising the temperature the ability of the air to hold moisture increases and the temperature rise causes pressure in your safe to rise (ever so slightly) as well. The pressure rise expels a bit of air and with it a tiny bit of moisture... until the pressure equalizes. Once the pressure equalizes, the heating rod is no longer providing any benefit.
You need a desiccant to remove humidity
No you dont need a desiccant. A goldenrod certainly is a dehumidifier.
Generally heat is used as a dehumidifier..
the constant warm air rising and a safe is not a closed environment you will always have less moisture in a safe with a goldenrod than a tub full of soaked chemicals. Forget ahout that tub of chemicals for a year or so and see how good of a dehumidifier it really is. And how snuggily and rust free they would be after a year with just a goldenrod.