Pay walled, so all I could see before it closed was boil.
Further research (read 2 min) gave an answer of boiling in hard water plus filtering after removes more than 80% (soft water it is only 20%) because boiling causes lime scale to collect on plastics making them bigger and easier to filter out
So, if you have the hardest, hard water you can have 80% reduction with just a 1hr wait for cooling. Not quite a silver bullet. Interesting though
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