I stopped filtered water for my self years ago cause they filter the minerals out too. People as well as snakes need natural minerals. You can actually die if you don't maintain them. Like was said you can leave a piture out to dissapate the chlorine....But then once you put it in the bowl it does the same thing. I'm sure your snake doesn't jump right in the minute you give them fresh water.........If they do your a Baaaad owner!