How to Unclog a Toilet: 5 Methods That Actually Work

Understanding Toilet Clogs and Blockages

As a plumber, I have unclogged hundreds of toilets over the years. It's not glamorous work, but it is one of the most common problems homeowners face. The good news is most clogs can be cleared without calling a professional. A clogged toilet happens when something blocks water flow through the trapway — the curved pipe connecting the bowl to the drain. Common culprits include too much toilet paper, "flushable" wipes, hygiene products, or hair buildup. Toilet gurgling or slow flushing is usually the first warning sign. Australian toilets typically have a trapway diameter between 50 and 75mm. It doesn't take much to block the pipe, especially in older homes where mineral deposits have narrowed the passage. Toilet not flushing properly is almost always a blockage rather than a mechanical issue with the flush.

Method 1: The Plunger Technique

The first tool you should try when you need to how to unclog a toilet is a plunger. Not just any plunger will do — you need a flange plunger, not the regular cup plunger used for clearing sink drains.

1. Insert the plunger over the drain hole at the bottom of the bowl, pushing the rubber flange into the outlet
2. Gently push down to force out any air
3. Plunge using a sharp up-and-down motion to keep the pressure up
4. After 15 to 20 plunges, quickly lift the plunger off the outlet

It's important to keep the plunger sealed onto the outlet. Many people push down a couple of times and are surprised it didn't work.

Method 2: Using a Plumbing Snake

If your plunger didn't work and you still need to how to unclog a toilet, try a plumbing snake (also known as a toilet auger). This is a flexible metal rod with a corkscrew-like end that you feed into the toilet to clear or retrieve the blockage. You can pick up a basic toilet auger at most hardware stores for $30 to $50. Feed the cable into the bowl opening, turning the handle clockwise as you push further into the pipe. When you hit the blockage, you will feel resistance. Keep turning until it breaks free but go carefully — too much force can scratch the porcelain. Toilet not flushing after plunging can usually be cleared with a plumbing snake, because the snake reaches much further into the drain line than a plunger can.

Method 3: Enzyme Drain Cleaners and Hot Water

If the blockage is caused by organic material, you may be able to clear it with an enzyme-based drain cleaner and hot water. I recommend these products as they won't damage your pipes or your toilet and cistern components. Pour a litre of hot water (not boiling — boiling can crack porcelain) into the bowl from waist height. The heat and pressure can dislodge the clog. Add an enzyme-based product and leave it for at least 30 minutes or overnight. These products break down organic matter without damaging PVC, copper, or cast-iron pipes. This won't work on solid objects — it's best for slow-draining toilets.

When Professional Help Is Necessary

Sometimes a clogged toilet is a symptom of a bigger problem. If you have tried all the above methods without success, it may be time to call a licensed plumber. A persistent blockage could mean tree roots in your pipes, a collapsed pipe, or a clog in the main sewer line. If other fixtures are slow to drain, you smell sewage, or water backs up into your shower when you flush, call a professional. A plumber will use a CCTV drain camera to inspect the line — typically $200 to $400 for the inspection. If you are looking to replace your toilet cistern, expect to pay $300 to $800 for a quality unit plus installation. I always say it's best to sort the problem out early. I have seen people plunging away for months, only to find a pipe issue that would have been cheaper to fix sooner. When purchasing a new toilet bowl cistern, make sure it displays the WaterMark certification logo to comply with Australian standards.