I think the guy is asking if he knows the flow rate of his sytem (I'm assuming he's disconnecting a hose after components and before pump and timing it) if he can use that figure with a pchart to firgure out the head on his system.
Thats how I read his question anyway. Which makes me wonder...
Does the suction of the pump create a negative head on part of the system lowering the total amount of head?
peace.
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