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    Pump thrums on 230, but not on 115

    Hi all. I have a 230 single speed pump that thrums when running. I have switched it over to 115 and it is much quieter, my phone sound meter had it at 70db on the 230v and 65db on the 115v. Any help would be appreciated. https://youtu.be/jsnkEHIGc2s Thanks for all the suggestions, last...