I have a small water system (200,000 gpd) of gw wells and I need to remove Fluoride and Arsenic. The FL is 11 mg/l and the Arsenic is about 0.025. I thought about Activated Alumina but that may be a problem with the FL above 2 mg/l. The pH is 7.95. Maybe Bone Char to reduce the FL, then AA or RO...