Product review (3 stars): The filters are actually wicks that suck up the water
Large collection of guitars requires a humidity level of 50 or above. When the heater runs its dives into the teens. Be aware you must fill the tanks and BUY the additive or you will get growth quickly. The filters are actually wicks that suck up the water. There is no visible vapor, just a cool breeze blowing out. Takes a day but it eventually will get the room to 50% but thats on high. DO NOT try to pick up the wicks wet to try and sun them. They will crumble in your hands. Never owned one before but for temp seasonal use it does ok. For long term usage I would want one that either connects to a water supply or larger tanks.