I've had an extension built around the bath waste pipe, and it appears to be getting slowly more and more blocked.
After a few unsuccessful attempts with one of those bendy metal rods, I've looked back at the photos of the pipes (pre-extension) and noticed they are much worse than I thought. I though they travelled at quite a steep angle into the down pipe, but as you can see from this image, there are 2 right angles and the gradient is not all that steep - hence the issue I would think.
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