Hummm... I suspected as much. The fin shape can easily retain some water.
Still, you should be able to get better flow than what can be seen in the first pic (first post). Then again, that flow rate might be correct, it's really hard to judge without a measurement.
Since we know the Eheim 1250's curve, it's possible to determine the actual flow rate, with a simple (and cheap) manometer set up. Is this something that you'd be interested in doing?
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