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Why when running water in the basin does water come up bath plug hole?
Wiki User
∙ 13y ago
Your sink drainage (let's call the waste pipe from here 'A') and bath drainage (B) are probably linked together, meeting in one waste pipe (C) before flowing on to the mains drainage (D).
A should be higher than B, which is higher than C, which is higher than D, so when you drain the sink or bath, water should flow directly to the mains drain.
If there is a blockage in C (or possibly a narrower waste pipe than it should have), the water will drain slower than it should. When you drain the sink, the blockage in C will cause the whole system in A and B to fill up, and because A is higher than B, the water pressure will cause water to flow backwards through B, and enter the bath.
You need to either clear the blockage in C, or if the waste pipe is too narrow, it should be replaced with a pipe of the correct size (in the UK, this should be 40mm diameter).
Wiki User
∙ 13y ago
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