i hit the wrong one.... id say as large as i could get as they are controllable so if i ever decide i need more flow, or less flow, the option is a button away.
on my frag system i went with the largest one i could get at the time and its nice because i can power all my reactors, and use it as a return at the same time. If i decide to go a different route with my reactors i can simply dial the pump down
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