Fluoride removal from water without using electricity

We are interested in technology for removing fluoride from water through non-electrical methods. In simple word looking for Fluoride removal technology using no electricity but using some other method. Which can also remove other health hazardous salts by electrolysis via a solar operated system.  Does anyone have some novelty technology for this issue? We can go for collaborations/ NDA/MOU if the technology is foolproof. Write me in detail explaining the feasibility of your technology. Thanks.