<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>ryanschaefer</author><text>Maybe I am missing something, but I don’t see how this is feasible at all.&lt;p&gt;Running a mill filled with tons of earth for a day at 450 RPM seems to be an enormous amount of energy expenditure relative to the PFAS you’d be able to destroy at the concentrations in the US.&lt;p&gt;For their context, in which it was firefighting material in a small training zone, it seems like a great fit, but for widespread deployment this seems like a stretch.</text><parent_chain></parent_chain></comment><story><title>Ball milling destroys PFAS in contaminated soil</title><url>https://phys.org/news/2023-08-chemicals.html</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>giardini</author><text>If ball milling works, why wouldn&amp;#x27;t ultrasound (Knock the PFAS into components using ultrasound)? Both are in essence physical methods (as opposed to chemical methods).</text><parent_chain></parent_chain></comment><story><title>Ball milling destroys PFAS in contaminated soil</title><url>https://phys.org/news/2023-08-chemicals.html</url></story>