Product review (5 stars): Better than the brand-name filters
Cheaper and more durable than the OEM filters.

The metal mesh inside ensures they hold their shape, and the outer fabric is very durable. The six pack can last you for two years if you maintain them well.

We have moderately hard water (15-20 grains), and even with a softener, the filter forms crusty nodules on the outside after a couple of weeks, so we alternate between two filters. Moisture output drops noticeably (i.e. the tanks empty more slowly) as the filter clogs up with mineral salts. We run our humidifier 24/7.

The filters can be cleaned in the kitchen sink (sanitize it first!) with a hot water rinse and 30 min warm water soak. Lay it flat in the sink to reduce water usage. Add 2-4 tbsp citric acid powder to help dissolve stubborn hard water crust/stains. Rinse thoroughly with cold water. They come out almost as good as new. You can clean them this way several times before dust doesn't wash out anymore and the paper mesh begins to fall apart.

Don't forget to clean the base of your humidifier, too. It can also accumulate hard water and dusty gunk over time. Use an air duster to blast dust out of the fan unit.