Review on 💧 Optimal Moisture Control Silica Gel Packets+ by Elvis Kimbro

I bought these for my 3D printer's filament storage box to keep the filament dry. Assuming the color change is correct, they are doing their job of absorbing water. However, when they started turning pink and I tried recharging them, I found that they didn't recharge well in the microwave. It does a good job of removing the water from the silica, but that water just condenses in the bag where it's instantly absorbed as soon as you take it out of the microwave. Luckily, they charge up just fine in a regular oven. I set the temperature to 215 degrees Fahrenheit (just above the boiling point of water) and let the bags sit for 15 minutes. They were as blue as the day I received them and there was no condensation so they stayed the same once they cooled. It's going to be a little annoying having to preheat the oven every time I need to charge it. Otherwise, it's a cheap way to keep things dry. If the microwave doesn't confuse you, you will be very happy with it.