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Title: ridiculous design error
Review: Think these are cute products, bought the duck and penguin, one each for our kid's rooms. While they work fine to spray the mist, the "optional demineralization filter cartridge" doesn't fit in either of these models. In the duck, the handle is in the way and the hole may be too shallow. In the penguin, the diameter of the hole is too small. I don't know if the filter will fit in any of the other models, but my suggestion is don't waste your money unless you weren't going to buy the filter anyway.
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