How to Unclog a Toilet: The Complete Australian Homeowner's Guide

Imagine this, late at night another homeowner who'd had a dinner party and now had a blocked toilet. I can't tell you how many of these calls I took over the years. The panic in their voice was always the same – guests were still there, someone had just used the bathroom, and now the toilet wouldn't flush properly. Here's what I learned from all those late-night callouts: most toilet blockages can be resolved without having to call in a plumber, as long as you have the right tools and know how to use them.
First things first, you need to know why the toilet is blocked. Usually it's because someone has put something down the toilet they shouldn't have. The biggest offender is baby wipes – despite what the packet says, they don't break down like toilet paper. I've also pulled out kids' toys, sanitary products, cotton buds and, once, a mobile phone. If you know what went down there, you're already half way there.
Before you start, don't keep flushing the toilet. I know it's tempting to try just one more time to see if the toilet will magically unblock itself, but all you'll end up with is water all over your bathroom floor. I speak from experience on this one. It's one of those lessons you only need to learn once.

Using a Plunger the Right Way

The plunger is the best tool for the job, and if you don't have one, get yourself to Bunnings this weekend. You need a proper toilet plunger with the flange – that's the extra piece that hangs off the bottom of the cup. The flat sink plungers don't work so well on toilets. They cost around $10-15 and will save you a $200+ emergency plumber callout.
Here's the right way to use it: make sure there is enough water in the toilet bowl to cover the cup of the plunger, you need this to create a seal. Place the plunger over the hole and slowly push down to push any air out, then give it a good 15-20 firm plunges. The suction should dislodge whatever is blocking the pipe. When you lift the plunger off, the water should flow freely down the drain. If it doesn't work the first time, give it another go. My father always told me that if I couldn't unclog a toilet in three dives with a plunger, it was time to call a plumber. He was right more often than not.

What to Do When You Don’t Have a Plunger

So what do you do if you're at someone else's house and they don't have a plunger, or you've just moved in and the plunger is still in a box in the garage somewhere? Finding yourself with a clogged toilet no plunger available can be stressful, but there are still options. There are a couple of things you can try.
Hot water can dissolve a toilet paper blockage. Pour hot water into the toilet, but here's the trick, make sure you let the water sit for a few minutes before you pour it in. Don't pour boiling water into a porcelain toilet as the sudden change in temperature can crack the bowl. That's a lesson you won't forget in a hurry and the cost to replace a cracked toilet pan is around $400-600 for the toilet suite alone, not including the plumber's labour. Pour from waist height to use gravity to try and shift the blockage. Leave it for 10 minutes and flush the toilet as you normally would.
Alternatively, you can try using dish soap. Pour half a cup of dish soap into the toilet and let it sit for 20 minutes or so. The dish soap may help loosen whatever is clogging your toilet. Add some warm water and see if it goes down. These methods will only work about half of the time for a minor clog. If something solid is stuck in your toilet, you'll need to use other methods.

When the Blockage Is Further Down the Drain Line

If the clog isn't in your toilet, it may be further down the drain line. Knowing how to clear toilet drain issues that extend beyond the bowl itself is essential for any homeowner. This often happens in older homes where roots have grown into your sewer line or if the line has been clogged for years. If your sink or shower is also draining slowly or you're hearing a gurgling noise when you flush the toilet, you likely have a clog in your main drain line.
If you have an in wall toilet – they're common in some newer home renovations – you won't have access to your drain line like you would with an S-trap or P-trap toilet. You can't simply remove the toilet to work on it. Wall mounted toilets are installed to save space, but can be a real pain if you have to work on them. The same thing applies to an ambulant toilet in a commercial application. The toilet is typically wall mounted and set up for wheelchair accessibility, but you'll need professional help to work on it.
A licensed plumber will have a drain snake (auger) that can be fed several metres down your drain line to either break up or retrieve the object that's clogging your line. We also have cameras that can be sent down your line to locate the clog. This is a real time saver and can prevent having to dig up your entire yard to find the problem.

Things You Should Never Put Down Your Drain

Prevention is the best medicine, right? I've been on so many service calls over the years for clogs that were completely preventable. Things you should never put down your toilet include baby wipes (even if they're marked as flushable), sanitary products, cotton swabs, dental floss, kitty litter, grease or oil, paper towel, and any type of plastic.
The only things you should ever put down your toilet are faeces and toilet paper. That's it. If you have small children, make sure to keep your toilet seat down when it's not in use. Small children like to put objects down your toilet to watch them disappear. I had one customer whose small child put a whole package of baby wash cloths down the toilet. It took me over two hours to fish them all out. The mum was mortified but it happens more often than you'd think.

Why Chemical Drain Cleaners Aren’t the Answer

I don't recommend chemical drain cleaners for toilets. They're harsh on your pipes, especially if you've got older plumbing, they're terrible for septic systems, and they don't actually work that well on solid blockages. Plus if the cleaner doesn't clear the blockage, you've now got a toilet full of caustic chemicals that a plumber has to deal with, which makes the job more dangerous and more expensive. We used to charge extra for jobs where chemicals had been used because of the safety equipment required.
The other issue with chemical cleaners is they can damage the rubber seals in your toilet and the pipes. I've seen this happen more times than I can count. Someone pours in drain cleaner, it sits there eating away at the seals, and six months later they've got a slow leak that's causing damage they don't even know about until the floor starts to rot. It's just not worth it.

When to Call a Licensed Plumber

If you've tried the plunger multiple times and nothing's working, stop. You might be pushing the blockage further down where it'll cause bigger problems. If water is backing up into your shower or bath when you flush the toilet, that's a main line blockage and you definitely need a plumber. When you have a seriously toilet clogged situation with water backing up throughout your home, it's beyond a DIY fix. If you can see water pooling in your yard near where your sewer line runs, same deal. These aren't DIY jobs.

The other situation where you should call someone is if you've got a septic system. The rules are different and you can actually damage your system by using certain products or techniques. Septic tanks need to be treated with respect. Dad always said to treat septic systems like they're your best friend – look after them properly and they'll look after you.

If you've tried the plunger properly and the hot water method, and nothing's shifted after an hour or so, it's time to call someone. Don't leave it overnight hoping it'll magically fix itself because it won't. The longer you wait, the more chance you have of the blockage getting worse or water damage occurring. Most plumbers will charge between $150-250 for a standard callout, but that's cheaper than the thousands you might spend fixing water damage if things go really wrong.

Why Toilets Keep Blocking

Recurring blockages usually mean there's an underlying problem with your plumbing. It could be tree roots in the pipes, a partially collapsed drain, or buildup of scale and debris that's narrowing the pipe. Sometimes older toilets just don't have enough flushing power anymore and they struggle with modern low-flow water restrictions.
If your toilet keeps blocking even after you've cleared it, get a plumber out to camera the line and see what's actually going on. You might need more than just a quick unblock. Dad and I went to one property where the toilet had been blocking every few months for two years. The home owner had been calling different plumbers each time for a quick fix. When we ran a camera down, we found tree roots had completely infiltrated the clay pipes. The whole section needed to be replaced, which cost around $3,000, but it solved the problem permanently. Sometimes spending the money upfront to diagnose the real issue properly is the smartest move.
Most people can handle a basic toilet blockage with a plunger and a bit of patience. Keep a good quality plunger under your sink, don't flush toilet waste that shouldn't go down there, and know when to admit defeat and call in the professionals. Modern homes with in wall toilets present unique challenges that sometimes require professional expertise from the start. Your future self will thank you.