Use this dehumidifier in my basement room (approx 20m³) where my work is private. At first I had about 80% humidity in the room, but after regular use I could see the humidity in the room very reduced (an average of 60%). I would recommend to use the dehumidifier in the first few days to the fullest capacity and then as needed. A bit annoying I find the fact that the humidity sensor in the device only works when the fan is on. The fan is not really quiet, so I turn the unit off completely still when the desired humidity level is reached and switch it on again when the humidity is above 75% again. Otherwise, I'm really satisfied with the device and through the extra-sewage connection, you can also connect a hose to the device through which the water can then run off. If you are not using it, is located in the tank in my opinion a bit undersized tank. Since I am usually very satisfied with the function, I give four stars.