These filters work GREAT! Based on some of the reviews, I think they have no clue how to use a humidifier. We have really dry winters. I've used one for the past 20 years or more! You set the desired humidity level (I usually do 45 for comfort) by pressing the blue rain drop button. Then, you leave the humidifier to run and do its think during your dry season. ONE FILTER lasts ONE SEASON. So, if you live in a dry climate, you'd need four per year. In the Midwest, you need 1. I'm not sure why people are flipping their filters or throwing away after a week. That makes absolutely no sense. Check your user manual or online for instructions on properly installing the filter. It should be last 3 months! You should be able to install it and leave it alone until its time to put away the humidifier then throw this filter away.
I've had my Kenmore Humidifier for two years now. It runs well. It adjusts itself with ease and is great! However, the filters do not last. I will not use the chemical cleaners because of sensitivity issues. I rinse them and sometimes use white vinegar in small amounts to help. The filter lasts two weeks max. That's $36 a month minimum to run it and at the end of the two weeks, you'll be wondering when you got a smelly fish tank. I find it expensive for something with such a short life.
Filter was easy to handle - easy to remove old filter and very easy to install new filter.
I have been purchasing these replacement filters for over a decade and, until now, they have done the job. When I ordered a new set for this winter, they came in a thinner box because the filters are thinner. They now collapse when soaked. I have to use skewers to keep them upright. The filters also cannot maintain humidity when my furnace runs on days when the outside temperature is below 40 degrees. I will not purchase these again.