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First thought is to mechanically isolate the pump from the input and output plumbing pipes via what we call Fernco™ fittings in the US. These flexible rubber couplings will reduce the transmission of noise which hard couplings impart. Beyond that, you can construct a staggered stud wall with insulation woven between the uprights-again the point being to avoid a direct physical connection between the source of noise and the exterior of the enclosure. Good luck.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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