Product review (5 stars): I highly recomment these filters. I bought this one ...
I highly recomment these filters. I bought this one last year to replace the standard paper filters I usually used and just one filter lasted the entire season for me last winter (vs. as many as 6 filters during previous years). Of course, no filter will last long without following appropriate care guidelines, especially depending on water quality. I have very hard water and scale builds up rapidly but a vinegar bath on at least a montly basis is all that's needed to keep this filter scale free. Of course, after several months, the filter does degrade somewhat, but mine lasted from November into May last year. Caveat: I run my humidifier only during night time hours and I let the filter soak in container with water during the time that the humidifier is not being used.