it depends on the pump. my pump, a Danner Mag-Drive 3, throws out a good deal of EMI. makes my monitor flicker at 60hz, even with the motherboard tray and side panel (both made of 1mm thick steal) in between. didn't seem to hurt anything after a year+ of use, although my hard drives are at the top rear of my tower; the furthest distance possible from my pump. so...take that for whatever it's worth.
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