AO Smith X8 9-Litre Green RO Series Water Purifier, White A.O Smith Green Series RO Water Purifiers comes with superior technology and advance protection. X8 Green series RO not only ensure 100 percent RO purified water but also saves 2X water than an ordinary RO water purifier with its innovative Advance Recovery Technology. [Patent applied] A. O. Smith Green series X8 model has the highest recovery 100 percent RO water purifier in India. With RO+SCMT technology harmful substances are removed and MIN-TECH adds back essential minerals into the purified healthy water. This water purifier is perfect fit to suit your lifestyle and match your kitchen décor.