I remember myself & Jeff having a conversation about this a good year a go. I think it could be the next thing if we could get a 12v powered unit & just fill up with tap water:http://robinson-solutions.blogspot.com/2009/02/green-solution-to-replacing-toxic.htmlAlso see the hand unit:http://robinson-solutions.blogspot.com/2009/02/active-ion-cleaning-solution-mobile.html