Most blocked toilets can be cleared without a plumber. The usual culprit is soft waste, too much paper or a wet wipe, caught in the trap: the curved passage moulded into the base of the pan. A flanged toilet plunger used properly shifts most of these. If it does not, warm water and washing-up liquid, or a toilet auger, are the next steps. What none of these will reliably clear is a solid object wedged in the trap, or a blockage further down the soil pipe or drain, and those are the cases where it makes sense to stop.
The methods below are in the order worth trying them, from least effort and least risk upwards.
First, stop it getting worse
- Do not flush again. If the water is rising rather than falling, another flush adds a full cistern to a pan that cannot empty.
- Stop the cistern refilling if it keeps running into the pan. Many toilets have a small isolation valve on the pipe feeding the cistern that turns with a flat screwdriver. If the cistern runs constantly even when the toilet isn’t blocked, that’s a separate fault — see why a toilet keeps running.
- Protect the floor and yourself. Lay old towels round the base, wear rubber gloves, and keep children and pets out of the room.
- Check the other drains. Run the basin and look at the bath or shower. If they are slow too, or the toilet gurgles when they drain, the blockage is probably beyond the toilet, and the methods below are unlikely to help.
Method 1: give it time, then use warm water and washing-up liquid
If the water level is high but slowly dropping, a soft paper blockage may break down on its own. Leave it for half an hour or so before doing anything.
If the level has dropped back to normal but the toilet still drains slowly, squeeze a generous amount of washing-up liquid into the pan, then pour in a bucket of hot tap water, not boiling, from about waist height. The liquid helps lubricate the blockage, and the weight of water falling into the pan can push soft waste through the trap. Leave it for 15 to 20 minutes and check whether the level falls.
Two cautions. Only add water if there is room in the pan for it; on a toilet already near the rim, this method simply causes an overflow. And never use boiling water, because sudden heat can crack a ceramic pan.
Method 2: plunge it properly
Plunging works, but only with the right plunger and technique. A flat-cupped sink plunger cannot seal in the curved outlet of a toilet. You need a flanged toilet plunger, which has a soft extension below the cup that fits into the outlet hole.
- Make sure there is enough water in the pan to cover the plunger cup. If the pan is empty, add a little water; if it is near the rim, bail some out into a bucket first.
- Put the plunger in at an angle so the cup fills with water rather than air, then fit the flange into the outlet and seat the cup firmly over it.
- Push down gently for the first stroke to push out any trapped air without splashing, then pump firmly in and out ten to fifteen times, keeping the seal.
- Pull the plunger away sharply on the last stroke. The pull often does more than the push.
- Watch the water level. If it drops away with a gurgle, test with a bucket of water rather than a flush, in case the blockage has only partly cleared. If it drains at full speed, try a normal flush.
Two or three rounds of this are reasonable. If nothing has moved after that, more plunging is unlikely to help and risks splashing contaminated water around the room.
Method 3: a toilet auger
A toilet auger, sometimes called a closet auger, is a short hand-cranked cable inside a rigid tube with a rubber or plastic sleeve at the bend. It is made to feed round the trap without scratching the glaze, and can break up or hook out a blockage that plunging cannot shift. They are inexpensive from DIY shops.
Rest the sleeved end in the bottom of the pan, pointing into the outlet, and feed the cable in by turning the handle while pushing gently. When you feel resistance, keep turning rather than forcing it. Then withdraw the cable slowly, still turning, as it may bring the blockage back with it. Flush with a bucket of water to check.
A general drain snake or a wire coat hanger is not the same thing. Without the protective sleeve, bare wire scratches the glaze, leaving marks that catch dirt permanently, and it can push a solid object further round the trap where it becomes harder to remove.
Popular fixes that are not worth it
- Chemical drain cleaner. Products made for sinks are rarely suited to toilets. They tend to sit in the water in the pan without reaching the blockage, and leave a caustic mix for whoever deals with it next.
- Bicarbonate of soda and vinegar. The fizzing looks productive, but it does little to a firm blockage of paper or wipes. It is harmless, so there is no danger in trying, but do not keep waiting on it.
- Repeated flushing “to force it through”. This is how most bathroom floods start.
Signs this one is not a DIY job
Stop and get help if any of these apply:
- Something solid went down it, such as a toy, a phone, a toothbrush, a rim block cage or a sanitary product. Plunging can wedge a hard object more firmly. Removing it may mean taking the pan off the floor, disconnecting it from the soil pipe and refitting it with a sound seal.
- Other fittings are affected: the bath, shower or a downstairs gully backs up when the toilet is flushed, or the toilet bubbles when they drain. The blockage is in the shared soil pipe or the drain, not the toilet.
- Neighbours have the same problem, or an outside manhole is full. A shared sewer serving more than one property is normally the water company’s to clear, so contact them before paying anyone.
- Water is leaking from the base of the toilet while you plunge. That points to a failed seal at the pan connector, and continuing will soak the floor and possibly the ceiling below.
- It keeps happening. A toilet that blocks every few weeks has a cause beyond what is being flushed.
When one of these applies, Voltify Contractors’ blocked toilet service explains how objects, recurring blockages and drain problems beyond the pan are dealt with, and what to tell us when you get in touch. If it is the only toilet in the property and it is overflowing, our guide to what counts as a plumbing emergency will help you decide whether it needs an out-of-hours call-out.
If it keeps blocking: what to look at
Recurring blockages usually come down to what goes in or how much water goes through. Things you can check yourself:
- Wipes. Many wipes labelled “flushable” do not break down like toilet paper. Water UK’s Fine to Flush standard identifies wipes that have passed testing to show they break down in sewers and contain no plastic; Water UK says wet wipes make up more than 90% of the material in sewer blockages. Unless a wipe carries that symbol, bin it.
- The amount of paper per flush, especially on older or low-flush toilets that move less water. Flushing part-way through helps.
- The flush itself. Lift the cistern lid and watch a flush. If the cistern fills well below the marked water line, or the flush is weak and stops short, the pan is not getting enough water to clear the trap. That is a cistern fault, covered under toilet repair and installation, rather than a blockage.
- Children’s toys and rim-block cages. A small hard object lodged out of sight in the trap will catch paper every time, and no amount of plunging will move it.
If none of those explain it, the cause may be in the pipework: a pan connector or soil pipe with too little fall, scale narrowing the trap, or a partial obstruction further down. That needs someone to look at it rather than another round of plunging.
Questions people ask
Can I use a normal sink plunger on a toilet?
It rarely works. A flat sink plunger cannot form a seal in the curved, recessed outlet of a toilet pan, so most of the force is lost. A flanged toilet plunger is designed to fit that outlet and is much more effective.
I rent. Should I unblock it myself?
Trying a plunger is reasonable, but if that does not work, report it to your landlord or letting agent before arranging a plumber, as they may have their own contractor and the tenancy agreement will say who pays.
