Fluoride is a little more difficult to get rid of and also the filters are generally very expensive. Filters that incorporate activated alumina are most effective suited to getting rid of fluoride from water. An activated alumina filter of four.5″ x 20″ would be ideal for the Pentek filter housings. https://alkaline-sports08653.ezblogz.com/36587774/alkaline-water-bottle-no-further-a-mystery