Our house has well water with a salt water softener. When we moved in it was tested safe for drinking. I've been using it for a while, my cham gets a 2 hour shower on the mist setting once a week . Gets heavy fogging the rest of the week. This has worked for me all winter while he's inside. I was doing more showers for him, but no fogging last winter. Urates have been white, I have no cause for concern, but I guess the paranoid side of me wanted to see what other's with any experience thought about it. My understanding is the salt is so low(something like 1% of your daily value in a cup) that it shouldn't be an issue. Takes a few months before we have to refill the salt.