Product review (5 stars): My Aprilaire 600M works like new again
After running the furnace since November, by mid to late January I started noticing that the humidity was slowly dropping, and checked to make sure that the humidifier was still working properly. It was. I then did some research and found that the water panels become less efficient at evaporation when they start getting clogged up with minerals from the water passing thru them. After the new genuine Aprilaire water panel was installed, (an easy ten minute job) the humidity started climbing right away and got back to normal within about 12 hours. These panels are the real deal and I will continue to purchase them from this seller.