Product review (3 stars): If only they kept working beyond the first week!
Works as expected the first week and then ..... It's all down hill.  After the first week of use the filters stop wicking and go dry at the top. The only way to keep putting moisture in the air is to flip them over and put the dry end down into the water - several times a day.  Of,course, I forget many times and then the humidity drops.  It is frustrating but I don't know of another source for more better ones.  Would appreciate suggestions.