I'm using Espring water filter system, tested n certified by NSF. My advise is that when buying water filter system, consumers are encouraged to go to the internet (http://www.nsf.com) to check the listing status of a product labelled with the NSF logo to ensure that it is genuine. Espring system is compact n can filter out 140 contaminants. Has UV light to kill virus, and has indicator to tell u exactly when to change your filter (only 1 filter). If interested, can email: jodor38@yahoo.com, to find out more