Will high pH affect the efficiency of the Berkey Fluoride Filters?

High or low PH impedes the ability of the media to remove fluoride. For maximum removal efficiency, maintain the water being treated between a pH level of 5 and 7. Actual capacity is dependent on the level of contamination of arsenic, fluoride, and other competing heavy metal ions. Unusually high levels of these contaminants may reduce the capacity and efficiency of the elements.