Product review (2 stars): Unable to clean
I purchased this cartridge for the Honeywell 200. I had the humidifier for two months and dealt with mildew odor every 4-5 days. The only ways to clear the odor was to replace the cartridge, despite following the exact cleaning directions. That got very expensive and I returned the humidifier to the store. I could wipe the brown mildew from the outside of the cartridge but unable to clean cartridge.