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Mel ... the Calgon is used to clean the black water tank. You put it in after dumping when you're going to be traveling and the movement creates a sloshing effect which cleans the tank.
As far as drinking water goes, you might want to do a search. There have been recent threads concerning different types of water filters. Steve posted pictures of the one we use, but I don't remember when. I believe others have posted pictures and/or very good explanations of their water filters.
Oh, and by the by ... I also saw the liquid Calgon on the bottom shelf next to the Febreeze at the Walmart in Kalispell, Montana. It's so much easier to find now that I know what I'm looking for!
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