What is a Water Purifier? A water purifier is a device that removes contaminants and impurities from water, making it safe for drinking, cooking, and other household uses. Types of Water Purifiers 1. Reverse Osmosis (RO) Purifiers: Use a semipermeable membrane to remove impurities. 2. Ultraviolet (UV) Purifiers: Use UV light to kill bacteria and viruses. 3. Activated Carbon Purifiers: Use activated carbon to remove impurities and improve taste. 4. Ion Exchange Purifiers: Use resins to remove impurities and soften water. 5. Ceramic Purifiers: Use ceramic filters to remove impurities.