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Thanks again for the detailed advice. From your explanation, the main issue does look like the excessive number of bends and the current pipe layout. I understand your suggestion of turning the waste disposer outlet 90° to the right and teeing it directly into the horizontal run, and then...

Thanks for your reply. After passing through the wall, the waste pipe goes directly outside into a surface water gully (drain). So it shouldn’t be joining another internal waste line.

Hi all, I’ve recently installed an Insinkerator EC1000 food waste disposer under my sink, but I’m still having very slow drainage issues. Here are the details: • All my waste pipes are 40mm. • Clearance from sink bottom to waste outlet centre is over 280mm (so it should meet the...