The present invention relates to a filter element for disinfecting, cleaning and purifying household water, by removing pollutants such as heavy metals, bacteria, VOCs, and even radioactive substance. The present filter element comprises activated carbon, ion exchange resins (cationic and anionic), biopolymer and transitional metal oxide. Said biopolymer and transitional metal oxide are both in particle form and said transitional metal oxide particle can be either incorporated into the biopolymer particle or directly incorporated into the present filter element as individual particle. Maximum capacity of the present filter element can reach up to 150 L of household water. Some of the pollutants can be removed by up to 99% by the present filter element. A method of preparing the present filter element is also disclosed herein.