Michael, This "technology" was recently discussed in New Scientist magazine (25 Sept 2013 issue, page64). They clearly think it belongs in the snake oil category. They say that while there is some scientific backing that treating water this way might affect some of its properties, "there is no published evidence that this includes enhancing the growth of plants" As regards Kew endorsing it, the magazine contacted Kew for confirmation. Their reply was: " Kew has not endorsed the Vi-Aqua products since 2009. A recent press article in the Irish Independent that mentioned this endorsement and activities by Kew around it was inaccurate". New Scientist expressed surprise that Kew had ever taken the product seriously. Paul Cumbleton UK