| Re: hi How high will the return pump have to push the water?
I'm using a mag7 on my 55 with 4' headloss so it's supposed to be about 480 gph.
With that flow you would want a drain with a diameter of 1" to make sure it can keep up with the pump.
As far as the power going off, you need to make sure there is enough extra space in your sump so the water that flows back down to the return pump won't overfill your sump. There are alot of overflows now that wont loose their siphon when the power goes off.
Hope this helps.
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Victor
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