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Yep in some ways you are right, it comes down to Centrifugal pumps CANT suck water, they can only push water. Using that logic you can do what ever you want as long as your pump isn't trying to pull water up from a pool below.
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No, thats' wrong, thay can suck water just fine, they just can't suck air very well, and won't self prime.
*rushes out to shed to perform an expriment*
My spare 2500L/H Centrifugal pump (once primed) can easily suck water up 2 metres of 1/2'' tubing and spit out a decent stream.
Of course you wouldn't want to mount a pump like that in a mission critical suitation, since it only has to hickup and the water column will fall and the pump will be left trying to pump air in vain.