I'm actually not sure if they really do anything. I don't know why they got rid of the ion staff. If they cost $10 for two that would be more reasonable, $20 seems like a robbery on the street especially since you have to buy so many of them. I have had an Air O Swiss humidifier for 5 years and now I know where they make money from these things and their cartridges. The leftovers really add up and exceed the lifetime value of the unit, I will definitely look elsewhere if mine breaks.
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