Compared to the conventional wet-type dryers, which are very popular in the industry, the BlueEvolution series have a unique machine concept. The complete dirt lands in the water filter and is simply emptied at the end. With wet dryers, you have to be careful when changing from wet to dry suction, because in case of a user error, filter cartridge and nonwoven can quickly become contaminated. This is a real breeding ground for molds and germs