To get that perfect flush, you need a functioning toilet float. A toilet float is a little device that essentially allows your toilet bowl to fill with water without overflowing. Sometimes called a ballcock, this little device can get messed up from time to time and leave you with a crappy situation on your hands. If you can't seem to get the right amount of water in your toilet bowl (too much or too little) or the toilet sounds like it's constantly running, check your toilet float.