Abstract-The batch study process was adopted to study the defluoridation of water using alum impregnated on brick powder. Different adsorption parameters, viz. effect of pH, effect of dose and contact time were selected and their optimization was done for the study. Alum and brick, when used individually are effective materials to cause defluoridation of water. But both the materials have certain limitations. Comparison of adsorption by Alum impregnated brick powder was made with adsorption by brick powder. In the optimum condition of pH and dose of adsorbents, the percentage defluoridation from synthetic sample for Alum impregnated on brick powder was found to be 4.0-5.0 % higher than the defluoridation due to brick powder. The test was performed on synthetic water prepared by using public supply water. The water contained very little other impurities. Presence of other ions in synthetic water did not significantly affect the defluoridation efficiency of Alum impregnated brick powder. The optimum pH range for the material was found to be 6.0-8.0 and adsorption equilibrium was found to be 60 min. These conditions make it very suitable for use in drinking water treatment. Defluoridation capacity of Alum impregnated brick powder can be explained on the basis of the chemical interaction of fluoride with the metal oxides under suitable pH conditions. The adsorption process was found to follow first order rate mechanism as well as Langmuir isotherm. Index terms: Defluoridation; Adsorption; Brick powder (BP); Alum impregnated on brick powder (AIBP)