Slow Draining Bathroom Sink

2 May 2016
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United Kingdom
Hi all.

I'm having a bit of a problem with my bathroom sink. Basically it is very slow draining, and takes up to a minute to drain a few centimetres of water. Obviously I assumed there was a blockage so used drain cleaner and a snake to try and clean it. This didn't work so I removed the p-trap and cleaned it out, but there was nothing significant in there.

I held the sink bowl over the bath (with p-trap attached) and used the shower to put water in the bowl and it it drained freely. I poured water into the waste pipe and it didn't block either. However when I attached the sink back to the waste pipe it still drains very slowly.

Does anyone have any ideas what could be causing it to drain so slowly?

Thanks in advance.

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