If you have a couple of restrictive, high turbulence block, that you want hooked up, putting them in series will inevitably result is a very very low overall flowrate. The pump will be constantly doing some unpaid overtime, and we know that ain't good.
putting them in parallel, on the other hand, will give the pump some breathing room, and in certain instances you might even find that the per-block flow-rate might increase. For sure the overall flow through the pump and Radiator will dramatically increase...
if however you are stuck with easy-flow blocks, then series is unfortunately propably the best way for what you have.
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