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Originally Posted by unregistered
this is all as obvious as the tail on a donkey
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Yes, but it is the length of the tail
WAJ's numbers look about right for 1m of tube
Larger effect of couse for 2m, roughly :
For the Eheim1048 would give increase in C/W of ~ 0.02 for reduction in tubing ID from 12.5mm to 6mm