185
Researchers just discovered a massive 'jacuzzi bubbling with almost pure hydrogen' — a lucrative source of clean energy
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I hope you are correct, because companies like Cummins are specifying they use “tap water”.
Page 14 point 1.
https://www.cummins.com/sites/default/files/2021-08/cummins-hydrogen-generation-brochure-20210603.pdf