My sump pump recently went bad and while replacing it, I also decided to replace the plastic corrugated tubing that was connected to it.
When I turned on the new pump, the amount of noise it was making sounded like there was an elephant in the basement. Best I could tell, that noise came from the corrugated tubing getting into some resonating vibration. After wiggling things here and there, I removed the new tubing and put the old one back in and now the pump is as quiet as a mouse.
As far as I know, this is a standard corrugated tubing for use with sump pumps that I bought from the local hardware store. But it appears to be made of a slightly harder plastic than the old tubing and I think that is partially why vibration noise is so much higher.
Is there anything that can be done to eliminate the noise besides having to use really old tubing which I would like to replace at some point?