Product review (2 stars): Honestly, I will not buy these again.
Originally I was pleased that this wick filter has the metal "cage" on the exterior, assuring that it doesn't droop in my humidifier. But after a month or so it began to disintegrate. My water always looked nasty, and I was having to wash the unit frequently as a result. It was gross, and a complete nuisance. (If it is helpful to anyone, we have soft water)