The study looked at how to remove fluoride from drinking water using aluminum sulfate and ferric chloride. They found that aluminum sulfate works better than ferric chloride. The amount of coagulant and the pH level are crucial for removing fluoride with aluminum sulfate, especially at a pH of around 5.8. High turbidity makes fluoride removal less effective. HCO3- makes it worse, while SO24- and Cl- have less impact. The researchers also studied how aluminum sulfate removes fluoride.