Reducing humidity with a DIY moisture absorber
As you can see in this picture, the relative humidity in our place was very high during the winter monsoon. I do not know if it really was 99%, but it was high enough to give trouble drying our laundry, which makes all clothes stink. That is a small problem compared to what the high humidiy does to our digital cameras: if the fungus that makes clothes smell gets on the CCD or inside the lens, they wil be permanently damaged.
There is electrical equipment for reducing humidity, but a moisture absorber as descibed here does a decent job by using the natural properties of Silica gel.
How to make it
- Plastic box with lid 80 x 120 x 50 mm (box 1)
- Plastic box 80 x 120 x 80 mm. Box 1 should fit in the top of this box.
- Silica gel (we used about 200 ml)
- A mesh 80 x 120 mm, big enough to cover the bottom of the plastic box.
Step 1 - Prepare the lid
Heat up a nail and use it to melt about 16 holes in the lid.
Step 2 - Prepare Box One
The inner box needs around 16 holes in the bottom, we also put a mesh inside to keep the silica from falling through the holes.
Step 3 - Put a thick layer of silica gel in the box
Step 4 - Completing the moisture absorber
Appendix - Using the Moisture Absorber
Using it is pretty easy. Take a 15-liter box put all your gear in, together with the moisture absorber:
No photo, but: Don't forget to close the lid...
It works, look at these measurements:
Relative humidity went down from 84% to 45%, that's far above our expectations.
Drying the silica gel (and re-using it) is easy. I'll show that later.