Ligmar water cooler includes 4-stage water filtration through 3 filter media that effectively remove impurities and salts to enjoy pure chlorine-free water. PP filter effectively removes impurities larger than 5mm, such as suspended solids, mud, sand, dirt, sediment, rust particles and other solid impurities, while CTO filter removes large particles, water dirt, water odor and high absorption of residual chlorine in water. Finally, UF filter effectively inhibits viruses, bacteria, microorganisms, microscopic suspended solids.