It is 290gph at 0ft of head but I would expect that would be just a trickle at 4ft as at 4ft full power of 790 is reduced to about 550, if we took that to be linear which I cannot say it is, it would be 50 gph, I suspect it is likely 0 and would need to be turned up a bit to get any flow. I would probably want no less than 100 gph through it though to keep the motor from overheating.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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