Seems unlikely but it's not impossible. My guess though is that it's not a calcium buildup if it's only a couple weeks.
Try taking it apart, the instructions will show you how to put it together again. If nothing else, see how much effort it takes to spin the impeller manually -- if it doesn't turn or has a lot of friction then you know something's up. Maybe it's missing a bearing or something like that.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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