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grunfos selectric ups 15-50?

sometimes when it starts up its noisy
mel, December 2011
Shut side valves undo alen type screws clean pump or replace it with new one

ltd, December 2011
Mine is the same sometimes, probably to do with air flow, Wind comes in, against the outgoing flow of air, so you get a noise, a rumble type.

SD, December 2011