what i do is turn it on and run it until the powder compress down. you can see the powder moving down. it does not take long. i run it while i am filling the primer pickup tube then i turn it off. i will turn it on again later to repack the powder. but it is hard to tell if it needs it or not. but i do it. i have a after market powder cap weight system that has a weighted powder follower. this system worked well and now even better with the vibrator. when i first tried the vibrator i kept it on the whole time, but found that it was not needed. so now at the first and around half way or a little more for a second time. my egg vibrator is not loud.