Mineral-encrusted water pipe from a hot spring. Pipe shows six months of buildup which requires replacement twice a year.
https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...426#post200582
https://www.homemadetools.net/forum/...073#post149447
https://www.homemadetools.net/forum/...665#post170599
https://www.homemadetools.net/forum/...515#post170116
https://www.homemadetools.net/forum/...437#post181782
