Ever had a toilet start to overflow and wondered what to do to stop it? When a toilet overflows (perhaps because you flushed it twice -- because the first one didn't do the job), you realize your mistake only as water reaches the rim. A cool head and quick action can avert disaster. When an overflow is imminent, remove the tank lid and look for the hinged rubber flush valve at the bottom. It typically is suspended by a chain from a rod connected to the flush handle. Then, simply close the valve by hand to stop water from entering the toilet. To prepare for this possible eventuality, practice by opening your toilet tank and familiarizing yourself with its inner workings. Then, when it happens, you'll know just what to do. And that's the On The House tip for today.