Quote:
Originally Posted by bertoni
As I recall, some discoloration is normal. Is the tubing clogging? You could try running a bit of bleach through a small piece of the tubing, if there's enough spare to allow cutting a sample, to see whether the buildup is organic. I'd discard the piece of tubing afterward.
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I cut a piece of the stained tubing and the white is permanent, it does not come out, does not seem to be organic buildup. The staining is almost immediate, let's say after a couple of hours of constant contact with the vinegar.