They work great! Here's how to make any filter last longer if you use this thing at night: Empty the tank in the morning, leave the tank disconnected from the humidifier, empty, with the lid open to dry. Run the humidifier fan on high power for a while until the filter is completely dry. The electricity costs of a fan running for several hours are minimal. Even if you leave it off all day at work, I think it's cheaper than changing a moldy filter more often.
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