UNO, an under-sink system that provides good, safe water and does not require difficult assembly. Drinking tap water takes only one step: unscrew the water hose under the sink, screw UNO on and screw the hose back on. Nothing could be easier. Maintenance only consists of replacing the internal filter once a year or when the 7000 litre mark is reached, indicated by the LED on the head, which turns from blue to red. In addition, its small size and easy installation means you can always take it with you on holiday. If, on the other hand, you leave it at home, no problem: when you return home, the water coming out of UNO will still be good and safe, as laboratory tests prove.