I discovered the pictured purple goop at the inlet nipple of the pump in my Silvia whilst apart for cleaning today. The rubber hose from the tank to this inlet also had some purple goop at the attachment end, as well as a small amount of what looked like some mould or bacteria. Needless to say I've cleaned it out, though the pump nipple seems to be stained with the stuff. I'm just wondering if this is something I should be concerned about - presumably minute amounts of this are building up in my coffee. It seems to have built up over about 6 months since last apart for cleaning. The machine is about 18 months old and has been making about 1-2 brews a day.
Folks, any ideas?
Folks, any ideas?

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