re: Espresso machine

quote:

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Thinking back, it took me at least a week to realize that running water through the group head for 2 or 3 seconds before attaching the portafilter and starting the shot makes a huge difference. Much less sour. There’s cool water in the grouphead just like the steam wand that has to be purged

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I do this. It also flushes some of the old grinds off. I run hot water through the portafilter before I add the grind to warm it up as well.