Product review (5 stars): emptied the tank in one night, great deal
So far I'm very happy with this purchase. It's a great price for these filters that often run $10 a piece. I used them in our two humidifiers last night and the whole tank emptied. That's a good sign because when our filters were getting old they wouldn't humidify anymore. I'll update this review if I find that the filters don't last as long as they should (at least a couple months each).