Steam condenser stain

[mcmichaelangelo]

Has anyone using a steam condenser noticed a gnarly black deposit on the drain bucket, drain hose, and/or in your boil kettle resulting from the condensate? This is after a typical brew (doesn't matter what kind of beer I'm brewing - light or dark). Comes off with very hot PBW and scrub...





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[Vale71]

Most likely limescale deposit from the water (the one sprayed through the nozzle as steam obviously is pure water). I have no idea what could be staining it though.