Hi Chris
You are right it is the venturi effect that will create the added flow & in your case you only have 600 gph pushing through ,so you should be fine with the regular version,however as I mentioned before most people use penductors with higher flow pumps to be able to get the maximum effect of penductors,Personaly @ 600 gph I think you should use the smaller penductor to be able to see some difference in the output flow
Also keep in mind that head pressure & pluming elbows & .... ,will change the actual flow you get?
Good luck
Regards Proline support
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