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Originally Posted by Les
Possibly fair agreement, but tells us little
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Seems to be a clash of theory vs practise.
Perhaps dP of each block may help somewhat here for the theoretical angle analysis.
At 10LPM, dP of Storm/G4 is ~7.8mH2O, and for the basic Cascade is ~4.8mH2O.
Would suggest perhaps plotting a dP curve as suits against a few pump PQ curves, including dP for a heatercore and tubing. Determine the final flow rates, and then factor in the 0.53 sized orifice area for the Storm over the Cascade to arrive at jet velocity boost. I think you'll find that even for the weak Eheim 1046, or the E1250 which seems to be causing the most troubles in those graphs, that the boost is very substantial.