The best moisture absorber is one that works quickly and efficiently to wick away excess humidity from the air in order to create a more pleasant living environment. The most effective moisture absorbers are those made from silica gel, activated charcoal or calcium chloride. Silica gel absorbs moisture through its tiny pores and can hold up to 40% of its weight in water before it needs replacing. Activated charcoal has an even higher absorption capacity, as it is extremely porous and able to hold onto liquid molecules for long periods of time. Lastly, calcium chloride also works well as a moisture absorber thanks to its ability to draw out water vapor when exposed to humid air. In addition, all three materials are non-toxic, making them ideal choices for use around children or pets.