You will even if you don't "plan" it...(shut down)...
NOBODY...will set up a compleate system (skimmer, overflow, closed loop, return pump, fuge, top off, and other periphials) in one shot...NOBODY will put all these parts and peices together, glue up the plumbing, fill it with water, turn it on and walk away...NOBODY...
You will be testing the backwash/powerout capacity one way or the other..whether you want to or not...