Product review (3 stars): Not Quite Sure
After cleaning the entire humidifier and putting the new filter in place all was working great. Two days later when I refilled the water tank and turned on the machine a stale moldy smell started coming from the humidifier. This never happened last year with the original filter and it does not last long but I'm not quite sure why this is happening. I cleaned the machine again and even sprayed the filter with  Febreeze but the moldy smell still comes up when the the unit is first turned on. I'm not quite sure where the problem lies.