Compaq Water Purifier

Answers. 2 Answers found. Water purifiers basically work on the principle known as Reverse Osmosis (RO). In this technology water is made to pass through a selective membrane so that smaller impurities pass through the membrane and the pure water remains on the other side of the membrane. What are the types of water purifiers? There are various types of water purifiers: RO (Reverse Osmosis), UF (Ultrafiltration), and UV (Ultraviolet). Some water purifiers use a combination of various technologies, including RO and UV.