In a
previous entry I detailed what happens when mineral rich water,
left untreated, has the chance to establish residence in a boiler. The
water supplied to this machine was not hard water, but unfiltered.
What you see is mostly sand and dirt. Proper filtration not only
prevents breakdown, but erratic behavior of your espresso machine as
well. A small speck of dirt in the narrow tubing that leads to your
pressure stat can cause it to behave as if it is possessed. I imagine
the shots from this machine had a gritty mouth feel. Read more about
types of filtration
here.
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