After making bone broth I made bone-char for the first time. While in the retort I did a little research. Depending on the temperature that bone is retorted at, it will have different properties. https://www.sciencedirect.com/science/article/abs/pii/S0048969724065318

Bone-char is what is used in filters that remove floride from water and in Thailand they are experimenting on cleaning up the floride in ground water.

https://impressionsofaholobiont.com/2018/05/14/make-your-own-fluoride-filter-from-bones/