Product review (1 stars): There's no way these are brand-name filters
Lured by the cheap price, I ordered these in early December 2012. They arrived promptly, but in nondescript packaging. Just the filters in a clear cellophane wrapper inside the plain cardboard shipping box.

While they appear identical in design and appearance, they're not as pliable or flexible as the Holmes/Sunbeam filters I'd been getting from Wal-Mart. After just a few days of use, I began smelling a foul odor. Clearly bacteria in the water was building up and causing it. They also rapidly took on brown stains, a sign that either dead organic material or perhaps naturally-occurring minerals were accruing.

So I put another set in, and this time filled the humidifier with water from the Brita tap filter. The same thing happened. The off-the-shelf filters I'd been buying locally would last up to 6 weeks per pair. Since switching back to those, I haven't had a problem.

It seems the only way these "Holmes" filters will perform satisfactorily is if distilled water is used. Sorry, but there's no way I'm buying 10 gallon jugs a week just so I can save a few bucks on filters.