Product review (1 stars): Terrible substitute
The original filters from 2 years ago had a silver based anti-algae agent. This new filter with the "Ag+" marked on the side has a mess of fungus or algae growing within 2 weeks. I'm switching back to my Ag+ filter even if it does leave a bit of white dust on everything. Better than bacteria and algae spewing throughout the room.
Its a real shame because the I thought the humidifier itself was awesome. Now I can't recommend it at all.