Ok, after 6 months of using my well water in my kettle I get a blackish coating on the walls of the kettle. This coating make the water smell slightly..... I'd say dirty. You can kind of smell it when the water is boiling. So I use CLR in it to remove the deposits and were good for another 6 months. Now, when running a bath you can smell it as well. I can clorinate the tank and that last for a month before the smell comes back. Any problems in my pouring 2 bottle full in to the tank over night to clean it out and then rinse it out the next day.