I recently purchased one to kelp with drying laundry indoors. On the laundry mode which takes 6 hours my clothes are still damp and the water tank is only a third full (would expect it to be full). Before I ran it the first time, it told me that my flat has 55% humidity (which is the ideal temp setting they recommend) and has since struggled to lower the humidity to lower than 50% even when running it for most of the day (and the tank has never reached the brim). Could it be that my flat is just not that humid? Or do I have a dud? Do I need a more powerful one for laundry?