Product review (2 stars): Actual product does not look like the one here
Actual product does not look like the one here. There is no absorbent blue lining as indicated. We use the humidifier every night and have found that this filter begins to degenerate after about 10 days. The top quarter of it begins to dry out making the process less efficient and continues to get worse over the next 20 days. I turn the filter every night to try and extend its' life but by the end of the 3rd week of usage it is really not functioning well. I try to clean it with water/white vinegar mix as suggested and it helps a little but you can see deterioration in the filter material.  We spend over $100/year buying filter for this humidifier which is more than the unit costs. We finally decided to give up and bought a filterless unit that is doing the same job better and with less hassle or cost.