@coffeegeek @coffee @espresso Coll, bur: You might discuss the downsides: quickly decreasing effectivity of the devices (thus, price), and the fact that filters like the Brita may add mould fungus. That's what a German consumer protection test magazine concluded (it's a neutral test agency). https://www.test.de/Wasserfilter-im-Test-Gut-filtert-keiner-4840828-0/
I wonder if the fungus (if occuring) is an issue with the hot water used.