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Why is my drain blocked?

The cause matters when a blockage keeps returning or affects more than one fixture.

Common causes: Hair and soap in bathroom wastes, grease in kitchen lines, foreign objects, tree roots, collapsed pipework and stormwater debris.

What can I safely try?

Remove visible hair or debris from a plughole and use a sink plunger with enough water to cover the cup. For a kitchen sink, avoid adding more grease or food waste. Do not mix chemical drain cleaners, and be cautious using them before a plumber attends because they can create a splash or chemical hazard.

Why do multiple drains block together?

If the kitchen sink, shower, toilet or floor waste are all slow, the restriction may be further along a shared waste line. Gurgling, sewage smells or wastewater returning through a floor drain are reasons to arrange professional assessment rather than repeatedly treating one fixture.

Could tree roots cause the blockage?

Roots can enter damaged or poorly sealed underground drainage. A recurring blockage, outdoor overflow or problem that returns after clearing may need inspection of the pipe rather than another temporary clearing.

What should I tell the plumber?

  • Which fixture is blocked and when it started
  • Whether other fixtures are slow
  • Any odour, gurgling or wastewater backup
  • What plungers, products or drain tools have been used

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