Product review (5 stars): This has transformed the way I view my humidifier. ...
This has transformed the way I view my humidifier.  Before using this product, my room began to smell moldy in week two or 3 after switching out the filter and it was really an expensive endeavor to keep my humidifier going.  I have been using this product with the same filter for more than 6 weeks and there isn't a moldy odor and the filter itself looks spotless.