Product review (5 stars): Yep, this is the one
Last year I tries to save a buck and buy some off brand that had some sort of honeycomb mesh look to it. They barely held any water, making the humidifier run all the time. Here's the link http://www.amazon.com/gp/product/B0009H606C/ref=cm_cr_ryp_prd_ttl_hst_2

Not sure if Amazon deleted the link for the junky ones but anyhow, these filters are the ones to buy. They cost a few more dollars but they do the job as well as the ones that came with the humidifier and worth every penny.