Why Does My Toilet Double Flush?

If your toilet is double flushing, then you likely have a problem with your toilet flapper staying up for longer than it is supposed to. When this happens, the flush valve is left open, and excess water can leave the tank and enter the toilet bowl. If this is the case, then you may need to purchase new toilet flappers.

Wny toilet double flush

Another reason your toilet double flushes could be that the water level in your tank is too high. If your toilet is flushing twice, this article will explain how to fix it.

Read on to learn more about your toilet double flushing.

How Does the Flush Process Work?

To understand why your toilet double flushes, it may help explain how flushing works in the first place. Toilets are simple structures and come with two primary components: the bowl and the tank.

When you press down on the toilet handle, the tank water will slowly flow down into the toilet bowl. Due to the laws of gravity, the waste and water will then get sucked down the drain as more and more water flows down into the bowl.

In turn, this melange of water and waste will then make its way down to your home’s main waste pipe that connects to your community sewage system. Note: this may work differently if you have a siphon jet toilet rather than a gravity flush toilet.

If your toilet flushes twice, this article will explain why this may be happening and how to fix it. There are two main reasons why your toilet is double flushing.

Reason #1: Toilet Flapper Stays Up for Too Long

Your toilet flapper is a small rubber ‘trap door’ that opens to let the water flow into the tank from the toilet bowl. If the flapper functions properly and fits in the flush valve, it will close the hole, secure the water inside the tank whenever someone flushes it, and move securely back in place after the flush is complete.

However, if the flapper is too light or does not fit into the flapper valve, it may not be able to close its flush valve quickly enough whenever you press down on the flush handle. As a result, water will continue to flow from the tank into the bowl even after it has completed one full flush. Since gravity induces the flush motion, water will then flow into the bowl again, and the toilet will flush another time.

Depending on your specific situation, it may be necessary to replace your old toilet flappers even if they are the correct fit for your toilet model. For example, if no one used your toilet for a while, then there would not have been any water in the tank, and the toilet flapper may have gotten a little dry.

This would mean that the rubber may crack or simply become less reliable. Also, your flappers may not be fitted properly, which means that they will not properly secure the water in the tank after each flush.

To see if this is your problem, you should take the tank’s lid and flush your toilet. Is the flapper chain between your trip lever and your toilet flapper a bit too small, making it difficult for the flapper to fit in place? If this is the case, then you can probably repair it.

Or is the toilet’ flappers’ rubber too dry to easily land in and out of the flapper valve? If it is the latter, you may need to replace the flapper.

How To Fix A Faulty Toilet Flapper

Faulty toilet flapper

If the toilet flapper needs to be replaced, this is doable, and you can buy a new one at a local hardware store or online. However, to replace them yourself, follow these steps.

Step 1: Turn off the toilet’s access to water by shutting the valve

Step 2: Flush multiple times until the tank is empty

Step 3: Unclip your old toilet flapper from the toilet flush valve. This may cut off the flapper chain, but your new flapper will likely come with one

Step 4: Pull off the flapper edges attached to the tubular overflow valve. If you have a plastic flapper, you will hear a ‘pop.’ If you have a rubber flapper, it will just slide out

Step 5: Connect the new flapper to the flush valve and fit it into the tubular overflow valve

Step 6: Make sure that the flapper chain is the right length

If you are unsure what type of flapper you need to buy for your toilet, you should call a professional plumber to let you know which one to buy.

Reason #2: There Is Too Much Water In Your Toilet’s Tank

If there is too much water in your tank, this just means that more water will keep flowing into the bowl whenever you flush the toilet. Unfortunately, this means that it will refill once again and force your toilet to flush twice. Usually, there is too much water in your tank because your toilet valve is not properly adjusted. Luckily, this can be easily fixed.

How Do I Fix My Water Tank Level?

Step 1: Check if your toilet valve has a float arm or a float cup.

Step 2: If it has a float arm, use a screwdriver to tweak the screw on the fill valve to bring the float arm down. If there is no screw on the fill valve, it may be too old, and you may need to call a plumber to install a new fill valve float arm.

Step 3: If your toilet fill valve has a float cup, then you should find the float clip and clench and slide it down to bring down the water level in the tank. Some models also have a water level adjustment rod to adjust your toilet’s water level, which makes your life a little easier.

Frequently Asked Questions (FAQ)

Still have questions about your toilet and why it double flushes? Read on for answers to some of the more commonly asked questions.

What is Ghost Flushing in toilets?

This is basically when the water escapes from the tank little by little for a long time. This usually occurs because of a wearing toilet flapper, letting the water leak into the toilet bowl.

Why does my toilet keep kicking on and off?

This condition is known as a phantom flush. It happens when the water leaks from the tank to the bowl because of a problem with the toilet flapper.

How do you fix a phantom flush toilet?

You should check if your toilet flapper and refill tube is working properly and replace them if need be.

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