Product review (3 stars): barely ok
I live in Park City, UT where it's dry, and the furnace burns away any remaining humidity. We also have musical instruments that need 40% humidity.

The price is decent on these but they're not nearly as effective as the original Honeywell filters (that were blue on the OUTSIDE). The max humidity I achieve on this filter is about 35% when new. But at the three week point of continuous use it's always below 25%, and the quantity of water put into the air is about about half of new. So one of these filters lasts me only about three weeks.

In comparison, the Honeywell filters last a couple weeks longer and I can achieve 40-45% humidity. Unfortunately, I can't find the Honeywell filters any longer so I may have to buy these again.

By those measures these filters are just barely OK, though I have no way of measuring how well they filter particulate matter.