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I have 2 AC 110 on my 125 gallon tank. O shut them off yesterday while i did my water change and when i turned them back on one had the motor lock up from sand. I took it apart and put the impeller out and cleaned it off and cleaned out the motor and put it back together. It now works but still can hear it grinding against sand. I didnt want to risk it locking up while at work so i shut it off. What else can i do to get all the sand out and make it right again. Only having 1 AC on it right now is worrying me.