Remington makes a rechargeable dehumidifier designed for safes. This past year we added a sunroom to our lower floor, and put a hot tub in it. Unfortunately my safe is on the lower floor. Rust has become a major issue as the hot tub makes a salt-water mist. I caught what was going on with the handtools in my work room
as well as a suit of armor I was working on. Until I could rectify the problem I got the remington gun safe dehumidifier as a short term fix,,,
,,, it worked really well. I do use breekfree, I do clean monthly, and I only open the safe to get what I need. I recharge it weekly by just plugging it in the wall for six hours or so and then back in the safe it goes. When the crystals go pink it's time to recharge. At the cost of 25 dollars or so it's a cheap fix considering the cost of what it's protecting. It's taking care of a 42 gun safe which is pretty good size. I imagine a smaller safe without a hot tub close by would last much longer,,,, but it's rechargeable so who cares?
I finally did resolve the mist issue, but that's another story.