We have all had it happen to us at least once, and that is if we are lucky enough it happens only once. So you are asking just exactly how to keep a toilet from overflowing. Well here are a few tricks that may help you out.
The first and foremost thing to do is completely shut the water off to the toilet. Most toilets when installed are installed with a shut off valve. This should be located under the toilet on a supply line. If your toilet does not have a shut off valve and your toilet overflows quite often, you may want to invest in one.
If your toilet is not equipped with a shut off valve, of course, you can try plunging it. As long as there is nothing wrong with the main line coming into the house and the toilet is not stopped up completely, plunging should help the water to go on down without it running out.
Depending on exactly why the toilet is overflowing you can also try pushing the flapper ball all the way down. This will keep the water running into the tank instead of the bowl. This will not help if the water is running into the filler tube. In this case the water will have to be shut off completely to keep it from overflowing.
You can also try bending, in a downward motion, the brass rod on which the flapper ball is located. Occasionally this will help with the overflowing problem until you can get the toilet repaired or replaced. You need to use extra care when bending this rod since it is extremely easy to break.
When your toilet continues to overflow it is best to either go ahead and try a new fluid master or try to push closet auger down the toilet to see if there is something blocking it. One trick of finding out if your flapper ball or flush valve is bad is to put food coloring in the tank (make sure it stands for at least three hours before flushing). If the food coloring appears in the bowl, then the flapper ball or flush valve or both will need to be replaced.
As a last resort to keep a toilet from overflowing you can also turn off the main water valve to your house. This can give you the time you need to connect a shut off valve to the toilet. Then you can simply turn the water off to the toilet only.
Therefore, hopefully these tricks will help out the next time you need to keep your toilet from overflowing.