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Review title: Is it needed?
Product review: I replace this once a year as I only use the humidifier during the winter in my kids rooms (I have one in each room). Since its my kids I care about safety and if the manufacture says to use this and replace it I do.That being said, do you REALLY need one ?? No, but I feel safer. This is why I gave it 4 not 5 stars. I my be snake oil as far as I know, but I will replace it anyway.
