Sure I can! The testing conditions were the same, that's the basis.
The pressure drop causes the pump to fall below its 0 rating. If the pump is of a high capacity design, then the flow rate won't drop too far from the 0 rating. If it is not a high capacity pump, then the flow rate will drop dramatically, as it did here.
Neither pump can be qualified as "high capacity", but the Renna does respond better to flow resistance than the Eheim.
More testing would provide a graph of flow rate at different pressure drops, and these two pumps would meet somewhere, in a slightly more restrictive rig, above which, the Renna would achieve a better flow rate than the Eheim. That part is very clear. Do you see it?
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