Product review (1 stars): Lost shape immediately
Ive been getting the single or two packs of these filters for two years and those have been good (they last around 3 weeks each) but the one I put in the humidifier tonight essentially fell apart right when it got wet. It immediately didn't hold its shape. Ill be returning...hard to imagine the 4 pack filters are different than the single and two pack, but my experience with this 4 pack seems to tell me they are different.