As allergies I have noticed a significant improvement in my general health after the purchase of the first device. The daily Nießanfälle were greatly reduced and are reduced to an attack a day. The attack always comes when I in which the appliance is leave the bedroom and go into the living room. I have therefore decided to create a second device for the living room. If only one day, suffering after 10 years you feel more comfortable, the acquisition has already paid off. The unit is set to manual, UV lamp runs and ionization is switched on. The unit is 24 hours on low speed in use. The constant itching in the nose and throat is finally over. Of course, the device must permanently run everything else does not make sense. It makes the windows on to the garden and even the pollen are in the room. Always aspirate the filter or buy new ones.