Well... got a new humi for christmas so anything I put in it will be new! I put a CAO CX2 and MX2 in it this afternoon. After I let it soak up some humidity for the past few days. My wife bought me a small 25 personalized humi for my dresser. It came with a small puck in it, but for some reason I can't get the humidiy to stay above 60%. Maybe it will take some time.