How do I unblock a toilet myself?

Use a flange plunger with a good seal over the outlet. Push and pull firmly 10-15 times. If this doesn't work after a few attempts, call a plumber — forcing it can cause damage.

Can I use chemical drain cleaner on a blocked toilet?

Chemical cleaners are generally not recommended for toilets — they can damage the porcelain and rubber seals, and rarely work on solid blockages.

When should I call a plumber for a blocked toilet?

Call a plumber if plunging doesn't clear it, if waste is backing up in other fixtures, if it's a recurring problem, or if there's sewage overflow anywhere in the home.

How to Unblock and Plunge a Blocked Toilet: A DIY Guide for Homeowners

Christopher Unwin
Sep 7, 2024
2 min read

Updated: May 3

How to Unblock a Toilet — DIY Steps Before Calling a Plumber

A blocked toilet is stressful but often fixable with the right approach. Here's how to attempt it yourself before calling for help — and how to know when you've reached the limit of what DIY can do.

Step 1 — Stop the Water

If the toilet bowl is full and about to overflow, don't flush again. Instead, find the isolation valve behind or beneath the cistern and turn it clockwise to stop the water supply. This prevents an overflow while you work on the blockage.

Step 2 — Use a Plunger

A toilet plunger (with a flange — the extending rubber lip at the bottom) is the right tool, not a flat cup plunger. Place the plunger firmly over the toilet outlet to create a seal. Push down slowly and firmly, then pull up sharply — you're trying to create pressure both ways to dislodge the blockage. Repeat 10–15 times. If water starts to drain, flush carefully to confirm the blockage has cleared.

Step 3 — Hot Water and Dish Soap

If plunging doesn't work, try pouring a few squirts of dish soap into the bowl, followed by a bucket of hot (not boiling — boiling water can crack ceramic) water from about waist height. The soap lubricates the blockage and the water pressure helps shift it. Wait a few minutes and try plunging again.

When to Stop and Call a Plumber

Stop DIY attempts and call a plumber if: the blockage doesn't clear after several attempts; other drains in the house are also slow or backing up (this suggests a main sewer blockage, not just a toilet blockage); there's sewage backing up into other fixtures; or you suspect something solid and non-biodegradable is lodged in the drain. ATC Plumbing provides same-day blocked toilet and drain service across Melbourne's south-east. Call 1300 282 758.