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Re:Instant water cleaning method ‘millions of times’ better:... by Algol on Tuesday July 06, 2021 @08:56PM (#27756193)
*palladium

Though I guess that is also a precious metal.

Re:Instant water cleaning method ‘millions of times’ better:... by wanderingmind on Tuesday July 06, 2021 @09:37PM (#27756416)
Catalysts are made from inert metals which are all expensive.