They are not the quietest pumps at the best of times, however if it's really rattley it could be a dirty impeller as suggested. Also check the impeller rod, check how freely the impeller magnet spins over that thing, a tiny bit of friction here due to calcium buildup can go a long way to making the pump noisy overall. Also open up the impeller housing and check around, sometimes the holes that the impeller rod sticks into (one on the cover and one on the pump under the impeller) get enlarged a little bit with wear and tear and this will make the pump pretty rattly as well. If the pump was never used though then it could just be a loud pump..
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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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