Product review (5 stars): Just like the one that came with the unit
Just like the one that came with the unit.  Takes only 15 minutes on low speed to get the filter wet, then turn to med speed and stand back. Only took two hours raise the humidity of our house to above 40 percent. (we live in New Mexico).  This one fits tighter to the bottom of the fan unit so more air has to go through the filter. The only down-side of this filter, is that it becomes very soft, meaning that you cannot rinse the build-up out of it. It last us between 3 and 4 weeks before it starts to get "crusty".