Thanks Duncan, yes mine is as you describe.
I have about 20m of rods, the rubber disc, the dragger and the corkscrew. I'm fairly handy with the rods, keep twisting them clockwise. Losing them down the drain would turn a drama into a crisis. It's clear now, and the trap seemed to be the cause of the backup. I know there were some tree roots beyond, but Thames Water used the cutting jet on those about 5 years ago and I've removed the tree now. Maybe there is a bit of regrowth that has slowed things down.
Time will tell, I'm just hoping this won't be a monthly job ad wondering what to do if it is. One option is to dig a big hole and put a straight pipe in but I won't be doing that and don't think there's be much change from £3,000. The pipe beyond the chamber crosses a ditch and it's cased in concrete.
If there is a root problem I can just about argue it's not on my land. The chamber is about 2m metres on my side of the gate and that's about how far down the roots will be. I've had the rods through but it was a bit of a push. I'll try the corkscrew next time.
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