The drinkable water in Souf region at the south east of Algeria contains high quantity of fluoride which causes dental fluorosis. To reduce fluoride, we have chosen a sample with the biggest content of fluoride among many sources in order to coagulate it with Fe 2 (SO 4 ) 3 ·H 2 O. After that the parameters influencing (concentration, pH, temperature) are studied to choose the best conditions for better reduction.

El Oued is known for some diseases caused by fluoride concentration in drinkable water. To reduce it, we have chosen a sample with the highest content of fluoride among many sources in order to precipitate it with Ca(OH)2 and CaCl2. In order to get better reduction yield of fluoride, a study has been done on the influencing parameters (concentration, pH, temperature) to choose the best conditions. The remove of fluoride is favorable at low concentration of Ca(OH)2, at room temperature and normal acidity.

The drinkable water in the south east of Algeria contains high quantity of fluoride which causes dental fluorosis. To decrease fluoride, we have chosen a sample with the biggest content of fluoride among many sources in order to coagulate it with Al 2 (SO 4 ) 3 ·18H 2 O. After that the parameters influencing (concentration, pH, temperature) are studied to choose the best conditions for better reduction yield.

El-Oued is known for some diseases caused by fluoride concentration in drinkable water. To reduce it, we have chosen a sample with the highest content of fluoride among many sources in order to coagulate it with Al 2 (SO 4 ) 3 ·18H 2 O, Fe 2 (SO 4 ) 3 ·H 2 O and FeSO 4 . In order to get better reduction yield of fluoride, a study has been done on the influencing parameters (concentration, pH, temperature) to choose the best conditions. The remove of fluoride is favorable at low concentration of Al 2 (SO 4 ) 3 , at room temperature and normal acidity.

El-Oued is known for some diseases caused by fluoride concentration in drinkable water. To reduce it, a sample with the biggest content among many sources was chosen. A comparative study between the precipitation with calcium salts [Ca(OH)2, CaCl2, CaSO4] and the coagulation with the following salts [Al2(SO4)2·18H2O, Fe2(SO4)2·H2O, FeSO4] was done. Finely we studied the parameters influencing (the mass, pH, temperature) to choose the best conditions in order to get better reduction yield.