Hydrosorbent OSG-40 Silica Gel Dehumidifier Desiccant 40 Gram Orange NO Cobalt (II) Chloride

works ok in my small safe--but it has to be dried out in the oven at 300 F for 3-4 hours to remove the moisture. replaced it with a 110V rechargeable plug in. unit costs more but I don't have to heat up the oven to dry it out every couple of weeks.

Background/Use: I like to cap my own supplements using empty gelcaps and bulk powders. To accomplish this, I use a capping machine and buy gelatin capsules 1,000 at a time. I had trouble getting the previous caps to fit into the machine so I figured they must be absorbing moisture. So when I bought my present package of empty capsules, I also purchased this dessicant box to keep them dry. The relative humidity in my house stays between 40-50% (40-pint dehumidifier in the summer and many humidifiers in the winter) so I'm not fighting some crazy conditions to begin with.When I got the gelcaps in, I tried them in the capping machine and though some of them were a tight fit, they worked as received. After that, I transferred them to a gallon ZipLoc bag and put this dessicant box in. 5 days later, I tried them again and to my surprise, the capsules had actually LOST MOISTURE. I was just hoping to prevent them gaining any additional moisture but to lose moisture was astounding. They all fit right into the capping machine with no resistance and in fact the top half fit so loosely that a couple of them wouldn't stay in when I flipped it upside down to press onto the filled bottom half. I did not have high hopes for this so I was looking for a solution involving calcium sulphate (the ultimate dessicant) but now I doubt I will need anything stronger than this.Bottom line: For keeping capsules dry, this works splendidly well.

This looks like an excellent tool to keep smallish air-tight spaces dry. However, I was too optimistic about what it might do for spaces that are not completely air-tight. The cupboard that I was hoping to control has small gaps around the door, and apparently moisture was coming in through those gaps at about the same speed that three of the these dehumidifiers were absorbing it, so they were not effective in my application. The device did work as advertised... it absorbed moisture and when I put it into the oven the moisture was expelled. I am now using one of them to keep some electronics inside a metal box with a tight fitting lid dry.

I wanted to protect my video camera and video gear from moisture but the thin metal casing the pellets are in is not sealed. I'm not sure if it's supposed to be, but I just put it in my pelican case with my gear and on day 2 of filming I opened up my case to grab a lens and hundreds of tiny pellets spilled out of my case on the client's floor where I was filming. They're all over my bag too. I am on an 8 day shoot so I have not had the time to go through and clean up my case. I wanted to like this product, but I cannot recommend if this is a possibility.

I ordered 2 of these for use in a 40" gun safe. They have done a great job in eliminating any moisture and the fact that they can be "recharged" by heating them in the oven for 3 hours at 300*F makes them a great value. These dessicants let you know when they need to be "recharged" by showing a clear color through the small window on them. I purchased these in October 2016 and am writing this review August 2018 and these are still going strong. Some other reviews have noted that the window is hard to see through after heating them in the oven one time, but I haven't experienced that with the ones that I have FWIW.