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| The standard around here is the Demco L'thumper pump. That's a piston pump. Most planters are set up with a set of redball columns and then a metering orifice somewhere in the line.
If you're anywhere close to southern MN, contact www.ld-ag.com Nearly every planter around has a L&D fertilizer system. The equipment dealers won't touch it, they send you to L and D.
Good Luck. Sorry I can't comment on the electric pump. I've never seen anyone use one.
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