when there is a good flow on removing the bees is as easy as standing the super on end and the bees will leave on their own. in a couple of hours their was only 10 bees left. You have to make sure there is no brood because the bees will not abandon any brood. It has been wet and colder than normal this spring and the bee foraging time has been limited some what but the girls have managed to bring in a surplus, and clog the brood chamber. I should have added a super a week ago. I added a super and pulled 5 frames of honey out of the brood chamber and replaced them with drawn comb to give the queen a place to lay.