Product description: It starts to work immediately. It has considerably improved the quality , this is why tablets are the best way to reduce humidity quickly. They are universal and can be used in other products that work with absorptive granulate. When the tablet comes in contact with air it soaks up excess moisture and stores it in liquid form in the container on the back of the product. The granulate stops working when the relative humidity is low or the temperature drops below 10ºC. This is why the length of time the product lasts is always determined by these two factors.