RO Water Purifier generally uses a semi-permeable membrane to remove impurities from water. The RO process removes dissolved salts, bacteria, and other contaminants from water using pressure to force the water through the membrane, which blocks impurities and allows only clean water to pass through. This purifier is good for the places where water supply is not safe for consumption due to contamination or poor quality. Moreover, this purifier needs regular maintenance to ensure that the system is functioning properly. And, the pre-filters need to be changed periodically, and the RO membrane needs to be replaced every two to three years, depending on usage.