I have some Remington Filters that when the small balls inside turn Pink I plug them into the wall to rejuvinate. Then they are Blue.
But the Desiccant Filters I like best is the Boxes of Desiccant I get from MidwayUSA I get the 66 Sq Ft units for my big safe. They have stickers on the bottom of the box. When they indicate it is time to rejuvinate the desiccant you pull the bag from the box put them in the oven at low temp for a period and they rejuvinate. I have two in my safe for safety sake. They are very inexpensive. The Remington Units are around $29.00 The Boxes around $14.00.
They work very well.
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-- John F. Kennedy