Presence of fluoride in drinking water above (and some times even below) permissible limits (1.5 ppm accordingly to WHO) leads to fluorosis. Aluminum fluoride is less toxic than other fluorides. In this study, Al2(SO4)3, was incorporated in different amounts in soil and prepared soil pots by the mixture. It was noted that these soil pots had remarkably decreased the concentration of fluoride in drinking water. Aluminum sulphate may be used as a defluoridating agent in drinking water earthenware (soil pots). Langmuir and Freundlich isotherm study were also carried out.