How to unblock a kitchen or bathroom sink safely
A single slow sink is often caused by hair, soap, food or grease close to the plug. Simple mechanical methods are safer and more effective than chemical drain cleaners.
Safety classification
Safe homeowner task
This guide covers safe first actions only. It is not a licence to perform regulated work or enter a dangerous area.
What to do
- 1
Remove and clean the plug or strainer
Pull out the pop-up plug or strainer and clear hair and debris. Wear gloves.
- 2
Use a plunger
Fill the sink with a few centimetres of water, block the overflow with a damp cloth, and plunge firmly for 20 to 30 seconds.
- 3
Flush with hot water
Run hot tap water for a minute to help move loosened grease. Do not pour boiling water into sinks with plastic pipes.
- 4
Avoid chemical drain cleaners
They can damage pipes and seals, and make the job dangerous for a plumber if they do not work.
- 5
Prevent the next one
Use a strainer, scrape plates into the bin and never pour fats or oils down the sink.
When to stop
- Several fixtures are slow or gurgling
- Water rises in another fixture when you use this one
- Chemical drain cleaner has already been used
- The sink is still blocked after plunging
Plumbing
Prepare the problem, safety status and location once. The matching category and service will be pre-filled.
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