So I checked out the video. Very interesting… But no news there really. There was something else, about water science which talks roughly about the same thing. They also don’t mention much about espresso. They say the advantages of using good water for the coffee machine (in terms of boiler safe water) but don’t have a method of using their drop kit for espresso. But… But check this:
In any case, I tried it… I went to find the Epson salts, which I didn’t have any left. So I thought… I could just get some of the nastiness left behind in the kettle. Dilute a bit… As I live in the Thames Valley, this translates to concentrated chalk.
So I put some of that diluted calcium on top of the espresso puck, put an aeropress filter on top and brewed: Definitely a change in flavour, for the better.
Appreciate it’s a very crude experiment, but I think the idea is there.