Natedog
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The underground pipes that serve our house and next door are prone to blocking, and limescale is blamed for it. Most of the pipe is now plastic, although there is still come clay and some weird cheap-looking stuff (kinda looks like hardboard soaked in bitumen)
The guy from the water board who looked at it (conveniently lives next door :-D) said they describe it as "shale" - a mixture of scale and, erm, well I'm sure you can work it out.
It stops the bottom of the pipe being nice and slippy, so solids can't slide away as easily. Need to get it jetted really, but it only takes 5 mins to sort, so I'm not in any mega rush
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