Sometimes using floaters like chum mixer can be a risky decision, disaster in the form of squadrons just overhead landing to plunder your swim and turn it into a frenzy of unwanted activity is always on the cards. If your not careful it can have you tearing your hair out and stomping up and down the bank. However it is possible to feed them off with time and patience especially if you cater to their greed. Little and often is the key here as you want the bait to be eaten fairly quickly and create a situation of competition between them which will ensure they eat faster and fill up faster. Keep a catapult full and at the ready to top up the swim as soon as they finish. Eventually with time, patience and a little luck they will fill up and hopefully leave.