Reducing vibration noise

Re: Soundproofing to reduce pump noise

I had to isolate my in house shower pressure pump as we have wooden floor boards the vibration and sound travelled. I used a rubber mat which was rated at 20db reduction I think it was, then a high density concrete building block on 4 silicone rubber feet so as to add a large mass and de couple the vibration. worked much better than I imagined it would. Something like that could work.
 
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