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I can imagine back a time, when all Europeans used 10/14mm PVC Tubing and normal hosebarbs and not the special PUR-tube and some nice metalic Quickconnectors. That was the time where simple channeldesigns were on the market. In this time, Europeans testet eheim 1046 and 1048 against another and came to the statement that the 1046 is better at all than a 1048. The funny thing is, that they measured right. Because of the primitive blockdeign there was no advantage of the higher flow blocks, no difference with flow. The only difference was the heat dissipation of the pump. And the eheim 1046 and 1048 are still so similarly in terms of performance because of the same head, that it just sounds logically that there is no difference between the 300l/h pump and the 600l/hone (in real sytems somewhat 80l/h to 90l/h).
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i dunno
I was under the impression that simpler, low flow restrictive blocks (maze, etc.) benefited more from increased flow than more modern, restrictive blocks do