Product review (5 stars): Perfect
It seems that the only place I can buy these without having to break the bank is here on Amazon. My humidifier takes four filters. Shopping at Home Depot or Lowes is convenient if I'm already out, but they never seem to have these in a pack of four. I'm always having to buy two boxes at a time. That's just cumbersome... petty, but cumbersome. These get delivered no problem and they are cheaper.  I also prefer the style of these better than the generic ones from HD or Lowes.  I think these do a better job.  I also use the
bacteriostatic treatment. It seems to make the filters last longer. Very pleased.

http://www.amazon.com/BestAir-3BT-6-Humidifier-Bacteriostatic-Treatment/dp/B000CMHLMG/ref=sr_1_2?ie=UTF8&qid=1392647816&sr=8-2&keywords=humidifier+liquid