I have used Prill Water for over a year I believe it is. I can't say I've had any health improvements per se, but we do enjoy the taste of the water. It definitely is much smoother and does not seem to taste as chemical-laden as our regular tap water. If I run a glass from the tap, and then drink a glass of the Prill water, there is an obvious taste difference. It makes wonderful iced tea. Everyone in my family raves about my iced tea and no one else can duplicate it.