A blocked sink can be caused by debris in the trap or deposits further along the connected waste pipe. We check the fitting and nearby connections before choosing how to clear it. Water returning when an appliance drains can indicate that the restriction is beyond the sink itself.
Blocked Sink
A blocked sink can be caused by debris in the trap or deposits further along the connected waste pipe.
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Shared waste pipes
Appliance discharge returning into the sink can point to a restriction beyond the trap.
Care with small-bore pipework
Tool size, bends and concealed joints all affect how a sink waste can be cleared safely.
Sink traps and shared waste pipes
Dishwashers and washing machines often discharge into the same waste pipe as a sink. If that shared pipe is restricted, pumped water can rise into the bowl. Grease may also extend beyond the removable trap and continue along the pipe.
Contact us about a blocked sink
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Protecting fittings during clearance
Small-bore waste pipes, tight bends and concealed joints limit which tools can be used safely. Chemicals in standing water increase splash risk, and any joints disturbed during the work need checking for leaks.
When the sink keeps slowing down
A sink that improves briefly and then slows again may still have deposits beyond the first bend or access point. We explain whether further cleaning is needed and distinguish recurring build-up from a damaged or poorly connected waste pipe.
Blocked Sink: common questions
Is every blocked sink caused by grease?
No. Food debris, a foreign object, scale or a pipe fault can also restrict the waste.
Why do both bowls of a sink back up?
Both bowls may connect to the same restricted waste pipe.
Should different drain cleaners be combined?
No. Never mix drain-cleaning products because chemical reactions and splashes can cause serious injury.
Can a clean trap leave the sink blocked?
Yes. The restriction may be further along the waste pipe.
Should connected appliances be used while the sink is backing up?
No. Avoid running an appliance if its discharge would add more water to the blocked pipe.