Video narration
How does your home RO purifier actually clean the water? A normal filter catches visible dirt, but reverse osmosis, or RO, also separates dissolved salts and many impurities you cannot see. Water is pushed under pressure through a semipermeable membrane-a special barrier that lets water pass while holding back many dissolved substances. That is the key: RO is not just trapping dirt; pressure drives the separation. Water crosses the membrane as the cleaner stream, while water with more rejected salts and impurities leaves separately. The cleaner water is collected for drinking. This is why RO appears in home purifiers, seawater desalination, and some industrial water treatment. But it is not needed for every water supply, and some water leaves as wastewater. It also does not remove every impurity perfectly. So how does your purifier clean water? It uses pressure to send water through a semipermeable membrane: water gets through, while many dissolved salts and impurities stay behind.