"If the height of the setup is 5-6' , the head loss could be as much as 50%, meaning that the actual flow rate could be only 4-5000 litres per hour only instead of the projected 9000 litres per hour.
In that case, single pump users all have to upgrade bo?? "
No need, just change to a better pump, there are many around a lot better than Eheim 1264.
I forgot the headloss, my mistake, yes you need to factor that in.
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