Product review (2 stars): need work it back into shape
fits humidifier ok. since it is shipped flat, folded in half, and needs to be installed perfectly circular to fit in track on humidifier basin, it takes a little work to round shape. Did not seem as rigid or striff as original one, so hope it can remaining standing upright once wet. Will update after using it in humidifier for a while.

3/10/18 These turn stinky (mold or bacteria?) really fast, even using the essick bacteriastat. Then it makes the house smell awful. I find you have to replace them about every two  weeks. I have a name brand humidifer that uses round wicking filter but are name brand and they will last for a month or more before they start too stink.

Also these aircare filters are made really cheap. Wish I could find these filters in a name brand :(