But its also about block design then.
Many blocks see no difference with different flow rates.
Take Cathars as an example. He has stated that there is hardly (>1ÂșC) difference when using a Eheim 1048 (600lph 1.5H) or a 1250 (1200lph ?H).
Yet he could design a block that uses large pumps effectively.
I'd prefer to use 1/2" tubing as it allows for a better range of components, and optimisations, in my opinion. Different pumps, blocks, etc. easily.
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