So one of the baristas from my local was telling me today that when he was a youngster (maybe 30-40 years ago?) back in the old country all the espresso machines used salt as a filter. He said he missed the taste of it and has subsequently modded his home machine to do the same.
What's that all about? I think he's Sicilian.
Sounds like he's talking about a water softener rather than filter
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