Another Pump Question

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Now that I'm pretty sure I'll need a new pump I'd like to replace it with something similar to the EasyPro unit I had. I understand most of the specs like, voltage, GPH, wattage, etc. But I don't know what Max. Head means. In this case it says the unit I have has a Max. Head of 9m/30'. Can anyone tell me what that means?
TIA
 
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That means that you can force water up 30' vertically before the pump stops flowing ANYTHING. And you won't get 30' because there is equivalent resistance coming from your plumbing, fittings, etc. You'll need to figure out how much actual head you have and how much flow you need/want to find a pump that matches.

The major pond stores online will have a head calculator for your plumbing situation and the pumps should have a head vs. flow chart as well for you to use.
 
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