I have asked this question to Chan in NA and he said that unlike other brands , when Eheim says its 1000L per hour, it will be 1000 L per hour, even with medias. Actually I am skeptical about this so I am not surprised at the findings of TS at all.
However, if you look at artitcles that recommend flow rates for tanks, the drop in efficiency could be designed in to make sure that the flow is not too much at the outlet.
The again, Eheim cost a lot of money, so I think it make sense to get what you paid for.
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