If the drain is clogged with something (too much toilet paper, non-flushable items, waste, etc.), flushing the toilet will overflow inside the toilet bowl.
Flushing a clogged toilet will make it overflow and water will go all over the floor and down any holes in the floor and wall perimeter.
Stop Overflow
To do this, unhook the chain that connects the toilet handle arm to the flapper. This will keep the flapper flat and prevent additional water from entering the bowl. Reattach the chain with the water level in the bowl has receded. Avoid flushing repeatedly until you've eliminated the clog.
The clog will prevent the water from going down the drain, meaning it will overflow the toilet and get all over the floor. This can create a much bigger (and must smellier) mess. You should never flush a clogged toilet more than once. Instead, take the lid off the back of the toilet and close the flapper.
Letting a clogged toilet sit too long can result in more severe problems. Beyond the risk of overflow and water damage, the clog could also cause toilet water to back up into other parts of your plumbing system, affecting sinks, showers, and even your home's main sewer line.
Will a toilet eventually unclog itself? It may unblock itself, however, only part of the blockage may have been removed, allowing water to drain. This may lead you think the issue is resolved, when in fact it's building up and could cause more issues in the long run.
One of the strongest substances for unclogging a toilet is a commercial drain cleaner specifically designed for toilet clogs. These cleaners typically contain powerful chemicals that dissolve organic matter and stubborn blockages.
While it's typically not disastrous to let a clogged toilet sit overnight, fixing the problem is recommended. Most water-soluble components will eventually dissolve; however, some residual items may remain, leading to blockages. Simply put, there are more opportunities for a clog to worsen the longer you ignore it.
Substances like toilet paper and fecal matter will eventually dissolve within the toilet drain and clear the clog organically. However, blockages made from insoluble materials won't resolve on their own and typically require you to fix the clog manually or contact a professional before they worsen.
You may just be using it incorrectly. Do this: Next time you have a clog, use your plunger like this: Ensure the flange lip is unfolded. Get a good seal on the toilet drain (that is, make sure you're covering the entire drain or you won't have enough pressure to loosen the clog.)
DO NOT: Take the flush-and-a-prayer method of flushing again – and again - until the blockage breaks up. Chances are this could lead to overflow. DO: If water is already rising, lift the tank lid and carefully use the rubber floater to block water from filling the hole at the bottom.
A toilet's flushing mechanism relies on gravity to get rid of toilet contents. If the toilet is blocked, then water and the blockage may have nowhere to go, so the toilet continues to discharge water in an attempt to clear the blockage. This results in a toilet constantly running… which is bad news for your water bill!
You'll be pleased to know that a standard blockage, caused by flushing inappropriate materials or too much toilet roll, will unblock itself eventually. However, bear in mind that the problem will continue until you've had your drains jetted or rodded to remove any leftover obstructions.
Is it okay to leave a clogged toilet overnight? In most cases, you can leave a clogged toilet overnight. However, calling an emergency plumber near you might be warranted if water starts leaking from the pipes. A simple clog likely won't cause this, but an inexperienced homeowner messing with the plumbing could.
The most important thing you can do in this situation is don't flush a second time. Forcing the toilet to flush again releases gallons of water into the toilet bowl and will cause an overflow. A second flush will only create another disaster, in addition your current problem. Remember: don't flush again!
Pour in Soap & Hot Water
Dish soap is more dense than hot water, and it's also designed to help break down grease and grime—especially mixed with hot water. It should be no surprise, then, that this mixture can also help loosen many materials that can clog a toilet bowl.
Drano® Liquid Drain Cleaner, Drano® Dual-Force® Foamer Clog Remover, and Drano® Max Gel Clog Remover do not contain microorganisms. The trap configuration in toilets prevents these products from reaching areas where matter can accumulate and cause plumbing problems—so these products are ineffective in toilets.
Make your own drain cleaner by pouring one cup of baking soda and two cups of vinegar into the toilet and adding a half gallon of hot water. Dish soap can also help loosen some obstructions. When using either method, allow the solution to sit overnight and then flush the toilet to see if the obstruction has cleared.
Add 1/2 cup baking soda directly into the toilet bowl water surrounding the blocked toilet. Slowly pour 1/2 cup of distilled white vinegar down the inside of the bowl to avoid splashes. Stand back as a fizzy foam reaction occurs, potentially breaking apart paper. Let it sit for 15 minutes, then flush it repeatedly.
A very good method of unclogging a toilet without the need for a plunger is to use dishwashing liquid, especially if the obstruction is only partially blocked or results from grease or organic waste.