Product review (5 stars): Great Product!
This is a great alternative to the standard filters that have to be replaced every month with heavy use. I humidify to protect my musical instruments and I have to run my humidifier constantly on the higher settings. I have gotten a whole humidification season out of this filter and it will probably try it out again next season. With the standard filters, I would have had to replace about six times, so the cost savings alone is worth it, not to mention the hassle. Another thing I notice is that unlike the standard filters, this one goes back to work immediately if you accidentally run it dry. The standard filters seem to just stop working if you run them dry, until you manually re-wet them and if they are near the need for replacement, even re-wetting doesn't work.

The maintenance is minimal: Per the instructions, occasionally wash the filter in soap and water and then rinse. Also, if you see calcification soak the filter in vinegar, then wash. Honestly, I haven't done this as often as recommended, but still haven't had any problems. If and when this one wears out, I will order another.