the reason for letting it run for 5 secs then shutting down is to burp all trapped air out. you will notice that after it is turned off the itake tube inside the tank will bubble and the water level inside the mag will rise a bit. you may need to do this a few times to get all of the air out. Sometimes I even have to turn off, unlock the mag canister from the base and tilt it to the side just to get a few more air bubbles out.