Fluoride in high concentration can cause adverse health impacts on some organelles of human (dental and skeletal) especially for babies. According to the WHO guideline, fluoride concentration in drinking water should be limited in 1.5 mg/l. Therefore, defluoridation of the excess amount is a basic requirement. The efficiency of Alum as a coagulant to remove fluoride from water was investigated. The effects of chemical dosage of coagulant in different PH and mixing speed, initial amount of fluoride, to remove fluoride are studied. Experiments in three stages, including selecting the best dose, best PH and the best initial fluoride concentration was performed. Results showed that the best coagulants alum dose, 250 mg was obtained. Furthermore, the pH was 2.6 and the maximum efficiency range for the initial fluoride concentration of 14.4 mg and 97% was determined. Obtain results from this study show that the fluoride removal efficiency decreased with increasing in initial amounts of fluoride. This study has showed that Alum for removal of fluoride at low concentration is appropriate. Furthermore, was cheap and efficient and traditional in removal of fluoride. 

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1. Defluoridation of ground water by Poly Aluminium Chloride (PAC)