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Originally Posted by Dave
There is no change in RPM with AC pumps, they all turn 3600 rpm, so how do you get much of a change in head?
Sure you will get differently effect, but a variable rpm pump in series is much more effective.
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as restriction increases head drops...
but if you add more pumps that would compensate for the increased restriction and increase the head.
you would never increase beyond the mas head of a single pump... or would you :shrug: