>>Caustic Soda solution would normally be my first port of call rather than rods
Good for grease isn't it? This was paper for the most part, it's odds on that somebody has been putting workshop or kitchen towel, or builder's wet wipes, down. I rodded (plunged, more or less) the trap and the pipe beyond first, where the back up started but I still had to rod further up to get it moving.
I don't think the caustic would have penetrated a back up 10-12 metres long, but I'll get some in and run it through next time. It was clean when I'd finished, and I lifted the cover on the interceptor this morning (48 hours on) and it's still running through so it might be OK if not abused. It's on the calendar for the middle of next month.
In England the water board will clear any shared drain, or anything outside the householder's boundary. Thames Water were doing some survey work on the main line with a big recycler and some camera kit when I got them to jet it 5 years ago. I gave the ganger a dozen eggs.
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