Fluoride removal filter.
https://www.emergency-wash.org/water/en/technologies/technology/fluoride-removal-filter
👉🏼 PDF: https://app.box.com/s/esbgo5jd8m25bfo7gphw05m97a3ly391 __ Fluoride is a groundwater contaminant naturally present in rocks and soils (commonly volcanic-derived sediments). At levels over 1.5 mg/L, it can detrimentally impact human health. As the health impacts result from prolonged consumption, Fluoride Removal is mostly relevant for the recovery phase and protracted emergencies.