How do you quiet you in sump pump

Try a rubber sink mat from a kitchen store. Just cut to size. Worked wonders for quieting down my skimmer pump.

Quik
 
They also make 100% silicone hot pads that Walmart and cooking stores sell. Just put one in the sump under the pump and it will quite it down. They have little dimples on them that help to create high spots that get rid of all the noise and vibrations. I used them for yrs under my pumps and skimmers in my sumps.
 
had some minicell foam [nonporous] left over after outfitting my kayak - works great, but the other suggestions sound like they worked fine as well
 
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