Water dispenser with UF technology Seven stages purifying 1. high quality PP cotton fiber 2. activated carbon+KDF 3. ion exchange resin filter 4. mineral stone 5. Antioxidant filter 6. hollow fiber ultrafilteration membrane 7. Silver loaded composite microcrystal carbon filter coreFreestanding Water Dispenser website:http://www.olansiairpurifier.com/water-dispenser/freestanding-water-dispenser/