A blocked toilet is one of those household headaches that needs sorting straight away. The good news is that most blockages can be cleared with the correct plunger and a bit of technique — no tradesperson required. Follow the steps below and you'll have things flowing again in most cases within a few minutes.
Choose the Right Plunger
Not all plungers are created equal. For a toilet, you need a flange plunger (also called a toilet plunger), not the flat-cupped sink plunger. A flange plunger has an extended rubber flap (the flange) that folds out from the cup and seats snugly inside the toilet's drain opening, creating a proper seal.
Using a flat sink plunger on a toilet rarely works well because you can't get an airtight seal over the curved drain opening. Flange plungers are widely available at Bunnings and Mitre 10 for a modest cost — as a rough guide, expect to pay somewhere in the range of $15–$40 depending on quality.
Before You Start — Safety First
- Don't flush again if the bowl is already full or close to overflowing. A second flush can cause an overflow onto your floor.
- Put on rubber gloves before you begin. Toilet water contains bacteria and you'll want to protect your hands.
- Lay old towels or newspaper around the base of the toilet to catch any splashes.
- If you've used a chemical drain cleaner prior to plunging, be very careful — splashing caustic chemicals can cause skin and eye burns. WorkSafe NZ recommends always reading product labels and wearing appropriate PPE when handling chemical cleaners.
Step-by-Step Plunging Technique
1. Warm the Rubber
If your plunger has been stored somewhere cold, run warm (not boiling) water over the rubber cup for 30 seconds. Warm rubber is more pliable and creates a better seal.
2. Ensure Enough Water in the Bowl
You need enough water in the bowl to submerge the plunger cup fully. If the water level is very low, add some from a bucket. The cup must be under water to generate hydraulic pressure — plunging air doesn't clear blockages effectively.
3. Seat the Flange
Lower the plunger into the bowl at an angle to let any trapped air escape from the cup. Then position the flange directly over the drain hole and press down gently so the rubber seats firmly and creates a complete seal.
4. Use Steady Push-Pull Strokes
With both hands on the handle, push down firmly and then pull back up sharply — keeping the seal intact throughout. The push forces water into the drain; the pull creates suction that dislodges the blockage. Repeat this rhythmic motion 10–15 times without breaking the seal.
5. Test the Drain
After your plunging strokes, pull the plunger away quickly to break the seal. Watch whether the water drains. If it does, give the toilet a flush to confirm the blockage has cleared. If the water level drops only slightly, repeat the process.
6. Repeat as Needed
Most soft blockages (toilet paper build-up, organic matter) clear within two or three rounds of plunging. If after four or five attempts the toilet still won't drain, the blockage may be further down the drain line or caused by something more solid.
What Causes Toilet Blockages?
| Common Cause | DIY Fix? |
|---|---|
| Excess toilet paper | Usually yes — plunging works well |
| Wet wipes / sanitary items | Sometimes — may need a drain snake |
| Children's toys or objects | Often no — may need professional retrieval |
| Tree root intrusion | No — requires professional drain inspection |
| Blocked main drain / sewer | No — call a drain cleaner |
Never flush wet wipes (even those labelled "flushable"), cotton buds, nappies, or sanitary products — these are a leading cause of blocked drains in NZ homes and can cause problems well beyond your property boundary.
After the Blockage Clears
Rinse your plunger thoroughly in the toilet bowl after flushing, then clean it with a diluted disinfectant solution before storing. Allow it to dry before putting it away to prevent mould growth.
If your toilet is slow to drain even after clearing, it may be worth pouring a kettle of hot (not boiling) water slowly into the bowl to help shift any remaining residue. Avoid harsh chemical drain cleaners in toilets regularly — they can damage older ceramic and rubber components over time.
When to Call a Professional
Call a licensed drain cleaner or plumber if:
- The toilet remains blocked after several rounds of plunging
- Multiple fixtures in your home (sinks, showers) are also draining slowly — this suggests a blockage in the main drain
- You suspect a solid object (toy, phone, etc.) has been flushed
- The toilet is overflowing or sewage is backing up into other fixtures
- You notice gurgling sounds from other drains when you flush
Drain clearing and plumbing work in NZ is subject to the NZ Building Code and some aspects are restricted work under the Plumbers, Gasfitters, and Drainlayers Act 2006. While using a plunger is perfectly fine for a homeowner, any work that involves opening, modifying, or repairing drain pipework must be carried out by a licensed tradesperson registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB).
You can find qualified, local drain cleaners and plumbers in your area at tradedirectory.co.nz.
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