Product review (5 stars): I purchased the humidifier that uses these filters because of ...
I purchased the humidifier that uses these filters because of dryness developing in the nose and around the lips while sleeping.  It took care of the problem.  You definitely need to use the filters so that u do not get buildup on your walls and furniture from line in the water.  I've used these every night from October to April for 2 years without having to replace the humidifier.