Product review (1 stars): ... filters do not seem to last or hold up like the genuine Honeywell "HAC-504" filters
The "Humidifier Filter Buy" replacement filters do not seem to last or hold up like the genuine Honeywell "HAC-504" filters.  These knock-off filters by "Humidifier Filter Buy" also had an odd odor to them after they were used for less then a few hours.  After buying these "Humidifier Filter Buy" filters, I discovered I could purchase genuine Honeywell "HAC-504" direct from Honeywell (HINT. . . The genuine filters were actually cheaper then these knock-off filters)

DO NOT PURCHASE