To unblock a kitchen sink, the restriction needs to be found in the trap or further along the connected waste pipe. Dishwashers and washing machines can share that pipe, so water returning into the sink during appliance discharge is an important clue.
Unblock Kitchen Sink
Kitchen sink blockages can sit in the trap or further along a waste pipe shared with appliances.
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Grease along the waste pipe
A clean sink trap can still leave fats and food deposits further along the connected waste.
Appliance connections
Dishwasher or washing-machine discharge returning into the sink can reveal a downstream restriction.
Grease beyond the sink trap
Food residue and fats can collect at bends and along the bore, not just in the removable trap. Hot water may move grease temporarily, but it cools further along the pipe and can build up again.
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Cleaning the waste and checking connections
The tools need to suit the small pipe diameter, bends and accessible joints. Chemicals already in standing water affect the precautions required, and any connections disturbed during the work need checking for leaks.
Reducing repeat kitchen sink blockages
Cooking oils and food residue should be kept out of the sink where possible. A strainer can help with scraps, but prevention advice will not correct a damaged joint or poorly configured waste pipe. Recurring backflow can justify further investigation.
Unblock Kitchen Sink: common questions
Why does the sink fill when the dishwasher drains?
The appliance and sink may share a restricted waste pipe, causing pumped water to rise into the bowl.
Will hot water permanently clear grease?
No. Grease can cool and accumulate again further downstream.
Should I keep using a connected washing machine?
No if its discharge is backing up into the sink or adding water to the blocked pipe.
Does washing-up liquid make grease safe to pour down the sink?
No. Fats can still cool and accumulate further along the waste pipe.
Can clearing the trap leave deposits downstream?
Yes. Longer-run cleaning may be needed if material remains beyond the visible fitting.