Why it has crystal while use dehumidifier box?

The lower layer of crystals in water is due to the low temperature in autumn and winter, and the water is still mixed with incompletely dissolved calcium molecules. At this time, what we can see is still structured water (calcium chloride hexahydrate = CaCl2·6H2O). When the temperature is low,incompletely dissolved calcium molecules will produce crystals, crystals mean an unsaturated state. These crystals can continue to absorb water until to arrive saturation, the molecules become calcium ions, chloride ions, water molecules, etc. At this time, it is completely liquid water, which proves that the product has finished working. In addition, crystals are not only affected by temperature. If the humidity in the air is not enough, the slow speed of dissolving water will also cause the water to turn into crystals. Crystals don’t mean bad, just is natural phenomena under temperature and humidity.