It can be quite a frustrating encounter when your toilet is either flushing partially, or not flushing at all. If not fixed in time, bad smell around your house, overflowing and build-up of nasty clogs are some of the issues that will follow up, of course, worsening the situation.
The most common reasons your toilet won’t flush when not clogged include too little water and dirt in the tank, worn-out or malfunctioning tank components (flapper, flush handle or button) and poorly designed piping setup. Blockages and clogs in the toilet drain pipes, inlet holes in your bowl and vents can also prevent water and waste from draining properly.
The following is detailed discussion of the issues and ways to resolve them. Some of the issues can be easily fixed while others will require services of a licensed plumber.
As always, when carrying out any repairs or fixes, protect yourself from the harm that may come from the tools, parts of the structure you’re fixing, and contamination from dirt and germs. For this reason, ensure there is enough ventilation, have a pair of rubber gloves, a mask, and other protective gear
My Toilet won’t Flush and it’s NOT Clogged
Toilet flushing issues that do not involve clogs usually revolve around the tank and its components. It has a lot to do with, the amount of water in the tank, which is determined by the condition of the tank, the float ball, the flapper, flush button/handle among other settings.
Condition of the Toilet Tank (Leaks/Cracks)
A broken tank will result in leakages. A leakage means the water in the tank won’t be enough for a proper and stronger flush.
The causes of a leaky toilet include;
- Misaligned or worn-out tank-to-bowl gasket (spud washer)
- Deteriorated or loose rubber washers at the bolts
- Worn-out or poorly-fitted fill-valve
- General wear and tear due to aging
- Crack in the overflow tube
This is most obvious sign of a tank leakage is flooding on the floor. Other signs include;
- Toilet runs intermittenly
- Toilet runs for longer than the usual amount of time/ or it runs but the tank does but the tank won’t fill
- You hear noises from the toilet when it’s not in use
- An abnormal rise in your water bill
The easiest way to fix a leaky or broken tank is to replace it especially old and worn-out. The other specific solution is to adjust the fill valve, tighten the loose bolts and align/replace the gasket.
Incorrect Tank Water Level Settings-Faulty Float Ball
In the toilet tank there is a level marked for which the water has to reach to provide a good flush. If this level isn’t attained, there will be too little water in the toilet tank such that when you flush it the waste won’t be washed away.
The amount of water in the tank is determined by how you set the float ball. There are two ways to adjust a float ball to provide the needed amount of water;
Method one; simply bend the stem holding the float ball to the rest of the toilet upwards.
The other method entails turning the screw at the end of the float ball arm in a clockwise direction to raise it upwards. This method is mostly used for toilet tanks with floating cup ballcocks.
For both solutions, you might want to repeat and readjust the float ball level to find the right level of water in the tank.
For the toilet to flush successfully, it needs a certain amount of water delivered at once to push through the P-valve to the drainpipe. If the right amount of water is delivered but not at once, it won’t flush correctly. If little water is delivered at once, it still won’t flush as needed.
The reason your toilet tank might not have enough water include a faulty float ball, poor settings on the water level in the toilet tank and dirt in the toilet tank. The following are fixes for these tank issues
Dirt in the Toilet tank
While quite uncommon, dirt in the toilet tank reduces the amount of space to be occupied by water. Such dirt be the floating type which takes up space at the top of the tank, or mud and other dirt that sinks to the bottom of the tank.
The likelihood for a tank that stays closed is muddy water whose dirt settles to the bottom of the tank taking up space that would otherwise be used by the water. If the tank is left open, children and pets can dump toys, sticks and other objects into the toilet tank with the result that there will be too little water for a proper flush.Solution
Depending on the type of dirt in the toilet tank, you should get it out accordingly. If there is mud at the bottom of the toilet tank, simply stir it up then flush it several times until you’re rid of it. You can also cut off the supply from the mains then give the tank a thorough wash. For solid objects, simply take them out and keep the tank closed afterwards.
A malfunctioning Flapper
The flapper of your toilet is the valve between the toilet tank and the pipe leading to the toilet bowl. It has the simple yet important role of allowing water to fill the tank by closing the opening to the toilet bowl, and allowing water to flow to the toilet bowl when flushing the toilet.
This piece of plastic or rubber can become damaged preventing the toilet tank from filling up completely. When the flapper has holes, it can’t close completely or the chain linking it to the flushing handle is stuck, water will leak into the toilet bowl instead of filling up the tank. When you flush the toilet, the tank won’t have enough water to fill up the toilet bowl and wash away the wastes.
The solution to this issue is often replacing the toilet flapper in totality. If it has holes or damaged in any way, you will need a new one. If the chain is broken or tangled, fix it as needed. A broken chain may require a new one while a tangled one will do with a simple un-entanglement.
A Poor Design of the Toilet Drain Pipe
The design of toilet drain pipes has to adhere to some rules which are put in place to obey the laws of physics. For example, given that there’s no pump drawing or pushing wastes into the drainpipe, gravity needs to be utilized. For this reason, all drainpipes need to have a sloping design to allow waste to flow easily to the sewage tank.
Without such a slope, the waste won’t flow to the drain and will instead pile up leading to a clog in the drainpipe.
At the same time, the drainpipe needs to be of a certain size for its contents to flow without a hinderance. In most areas, there is a law dictating how small a drainpipe can be with the focus being on preventing clogs caused by pressure imbalances and solid objects.
If the drainpipe is too small in size, flushing won’t be easy as it’ll easily get overwhelmed with the volume of water that flows into it.
The solution for this one needs a professional plumber to dig up the drainpipe and most of the plumbing system to lay it afresh. This is extensive work which we only recommend that it be handled by a professional. Mistakes made here can lead to serious consequences.
Poor Flushing Procedure
At times, it’s not the toilet but us the users that are the problem. The toilet’s flushing procedure is created in a way that allows a large amount of water from the toilet tank at once to flow to the toilet bowl. As noted before, if the amount is right but it flows slowly to the bow, flushing won’t be effective.
Some users don’t press the flush handle or flush button at once and instead do it slowly. This may only allow a small amount of water to leave the cistern and may lead to an inefficient way of flushing.
The solution is to flush the toilet by giving the flush button or handle one reasonably quick press. This opens up the flapper wide enough for the water to rush from the tank into toilet bowl effectively flushing the wastes away.
Toilet Won’t Flush Clogged
As mentioned earlier, apart from the tank issues, the other reason your toilet won’t flush strongly all the way is clogs which block the flow of waste and water. The clogs mostly occur in the drain pipes, toilet bowl inlets and vents.
A clog anywhere in your plumbing system, will stop water from completely flushing down the toilet.
Dealing with clog will depend where it is and how severe it is. It is very easy to remove light clogs especially those within the bowl. For severe clogs deep down the drain, we a recommend a professional plumber.
Check the following articles for DIY Toilet Unclogging Instructions
- How to Unclog a Toilet with Bleach + Hot Water
- Using Saran Wrap to Unclog a Toilet
- How to Use Salt to Unclog a Toilet
- How to use an Auger to Unclog a Toilet + What to do if it won’t go in
- How to Unclog a Toilet with a Wire Coat Hanger
- How to use a Toilet Snake to Unclog a Toilet
- Tampon Clogged Toilet – How to Fix It
- How to Unclog a Toilet with Poop in It-With/Without Plunger
Will a Toilet Eventually Unclog Itself? What Happens if You Leave it Clogged?
Clogged Bowl Inlet Holes
Underneath the toilet bowl is a series of holes through which water flows out from into the bowl. The purpose of having a series of holes instead of one single outlet helps spread out the water thus covering the whole toilet bowl at once.
These holes can get clogged up either by mineral deposits or dirt in the water. You can look at them using a mirror held facing the underside of the toilet bowl’s rim.
To unclog the inlet holes, you need to follow the procedure below:
- Heat about 12 ounces of white vinegar to at least 120 degrees Celsius.
- Remove the lid from the toilet tank.
- Pour the hot vinegar into the overflow tube of the toilet tank.
- Let the white vinegar stay in the overflow tube for at least an hour or even overnight without flushing the toilet.
- Use a piece of wire to clear the inlet holes then flush the toilet to clear away the remaining dirt.
Another solution is simply pouring muriatic acid into the overflow tube, waiting for a while then flushing the toilet.
Poor Venting and Blocked Vents
Venting toilets and other plumbing units in the home helps equalize pressure between the pipes and the surrounding air. This helps gases and liquids to flow freely in the pipes and other connections made on the plumbing system.
If the toilet isn’t vented properly, the imbalance in pressure will not permeate easy flushing. You might also observe bubbles in the toilet, bad odors indoors and other unpleasant experiences.
The solution to improper toilet venting is simply to inspect your venting system and fix where possible. Follow the resources below details
- How to Vent a Toilet
- Signs of Clogged Plumbing Vents
While some of these approaches can be done as DIY projects, others will require the input of an expert for the best results.
Why Toilet won’t Flush Strongly (Weak Flush)
There are times when your toilet flushes but water drains slowly or fails to drain everything in the bowl. Various issues may cause this. Some of them include:
- Dirt and mineral deposits might be blocking water flowing under the rim of your bowl. Partial blockage often results in a slow and weak flush.
- The flapper might also fail to open completely. When it fails to open, little water is released thus creating a weak flush.
- You might have clogged or blocked plumbing vents.
- Old and low flow toilets always have poor flushing power. The low-pressure results in poor flushing.
- You might be experiencing a sewer line problem. There might be plants, tree roots or any other dirt that develop inside the sewer line thus creating a backup. There might also be a partial clog in the sewer line that has never been removed when plunging. This causes poor flush.
Toilet not Flushing at all
According to some pro plumbers, the toilet might completely fail to flush due to the following reasons:
- Full sewer tanks thus creating a backup. This might cause clogging in the sewer line thus flushing proves impossible.
- The bowl might be clogged by materials such as toys, tampons, wet wipes, dead plants, and too much toilet paper.
- In some cases, the flapper is either bent or warped.
- There might be something stuck in the trap. The trap is S-shaped and separates the drainage line from your toilet. Tiny materials such as toothbrushes can easily get stuck in the trap and with successive flushing, more debris gets wrapped on the material eventually causing clogging.
- Dirt or other objects in the tank. They might have fallen inside accidentally or your kid might have placed them there. These materials might hold on to the flapper and prevent it from flushing.
- Old or worn-out Flapper and Fill Valve
- Insufficient water supply. You might have turned off the water supply through the valve that runs between the toilet and the wall. The water level in the tank needs to be an inch below the top of the overflow tube.
- The flush handle/button might be not be functioning well resulting in no flush.
- How to Flush a Toilet Manually
- Toilet Swirls but won’t Flush
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If your toilet isn't flushing all the way, it's most likely because of one of these problems: The water level in your toilet tank is set too low. Problems with your flapper. A clog in the toilet, flange or drain.Why is my toilet not strong enough to flush poop? ›
If you have a toilet that doesn't fully flush, common causes include a clog in the trap, a worn-out flapper, blocked rim jets, a faulty float, or an issue with the handle and chain.How can I make my toilet flush stronger? ›
Clear Flush Holes
These small holes push water from the tank down the sides of the toilet bowl to make sure all waste water flushes down the drain. Over time, the siphon jets will inevitably become blocked with mineral deposits. Clearing up the mineral deposits can provide more water pressure.
- Narrow Down Possible Problems. When a toilet doesn't flush completely, there could be any number of causes. ...
- Clear a Clogged Toilet. ...
- Check the Flapper. ...
- Check the Inlet Holes. ...
- Check the Overflow Tube. ...
- Check the Fill Valve Assembly.
Common causes of a slow-flushing toilet include low water levels, a partially clogged drain, mineral build-up on the jet holes, a defective flapper, and a blocked drain vent.When I flush my toilet it fills up with water then slowly drains? ›
Water Level in Tank
Low water levels in the tank are a common cause of a slow-draining toilet. This can happen due to leaks, evaporation, overuse, or a broken flush tube.
The vinegar dissolves the calcium (hard water build up) in the flush ring and the siphon jet, allowing the toilet to once again work as designed. Annual treatment could be necessary. Depending on the amount of hard water build up, repeated applications may be required.What is the best product for a slow flushing toilet? ›
There is only one Drano® product recommended for use in slow-running toilets: Drano® Max Build-Up Remover. It contains microorganisms that break down organic matter in pipes that can slow water flow.Does adding water to a toilet help it flush? ›
The main two ways to flush a toilet without running water when your main water supply is shut off are: The "Pour-Over" Method - This is where the weight of added water causes a flush reaction. The Tank Method - This involves adding enough water to the tank to pull the lever for a flush.Can you put Drano in a toilet? ›
For preventive drain cleaning, you can use Drano® Max Build-Up Remover in drains, toilets and even septic systems. Apply Drano® Max Build-Up Remover overnight or before you go to work, then wait 6 to 8 hours before running warm (not hot) water down treated drains or flushing treated toilets.
The efficiency and effectiveness of a toilet's flush largely depend on its design and engineering. Factors such as the size and shape of the bowl, the position and power of the flush valve, and the configuration of the trapway can all impact how well a toilet flushes.Why do commercial toilets flush better? ›
With a commercial toilet, the water needs to come from a larger diameter water supply line. A residential line simply does not have enough water pressure to flush a commercial toilet.