The LG water purifier's Dual Protection Stainless Steel Water Tank, maintain freshness of water and reduce the growth of bacteria and algae. Far more hygienic than a conventional plastic tank, it ensures that water remains safe for drinking with Dual Protection Seal.LG's Stainless Steel water storage tanks have 94.4% less E.Coli growth in 24hrs as compared to plastic tanks. Thus, stainless steel storage tank in LG True water purifier is safer than regular plastic tank in other water purifier.RO removes virus and bacteria; so there is no need of UV in the filtration stage. UV Cycle in LG True Water Purifiers runs during the Preservation stage. While the filtered water stored in Dual Protection Stainless Steel Tank is absolutely safe and clean to drink, The UV Cycle that automatically starts every 6 Hours.LG's innovative Digital Sterilising Care praised most hygienic method to sterilise the entire water path, Faucet and tank with the unique sterilising Kit that does not use any harmful chemicals.