These gelatinous charged hydroxo cationic complexes can effectively remove pollutants by adsorption to produce charge neutralization, and by enmeshment in a precipitate. Ming et al. [37] have reported the defluorination of water by electrolysis using aluminum electrodes. According to the proposed mechanism the Al3+ ions under high F− concentration may be induced to form AlF6 3− which was transformed to insoluble salt Na3AlF6 by adding sodium ions according to the following reactions: