What this symptom usually tells you
The most useful clue is whether the problem is isolated or appears elsewhere. Begin at the plug and trap area, then use a correctly sized sink plunger if the fittings are sound.
- Clean the plug and strainer
- Seal the overflow before plunging
- Check other bathroom fixtures
- Inspect accessible joints for leaks
Choose the next step, not the strongest option
Start with visible debris and the least aggressive suitable manual method. A repeat blockage, sewage backup or several affected fixtures needs diagnosis rather than another product.
- Check every nearby fixture
- Identify anything already poured into the drain
- Keep a note of gurgling, odour and water-level changes
- Stop before wastewater overflows
Step-by-step approach
- 1
Stop using the affected fixture
- 2
Check whether the problem is isolated
- 3
Remove only safely reachable debris
- 4
Try one suitable method if the signs support it
- 5
Escalate if flow is not restored or the symptom returns
Do not combine chemical products or use a plunger, snake or rod in liquid that may contain a corrosive cleaner.