Product review (4 stars): Does the job...
Works great. I buy this repetitively. I replace my filters once every 1-2 months due to extensive usage with my humidifier. New ones are a bit clumsy to replace. They are very thick and require a little jamming in my particular unit to get it in just right. When replacing, I always have to clean out residue from the filter itself. So it's doing it's job, but it collects and it's a bit nasty. Prepare for your hands to be very chalky afterwards.