118
'No-water' hydropower turns England's hills into green and pleasant batteries
(www.rechargenews.com)
this post was submitted on 17 Aug 2023
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Calcium carbonate. The density for a calcium carbonate suspension in water is right on the money for what they've stated. They're being so evasive because they haven't patened it and likely can't. They're treating it like a trade secret because they can't make it into IP.
Edit: yep, they use it in oil drilling, so they can't patent it https://glossary.slb.com/en/terms/c/calcium_carbonate