Chuck,

I live in NC and use well water exclusively, even filled my 24K IG vinyl pool with it (the horror, the horror!!!). My pool test kit can test the basics of the well water: calcium, pH, Alk, etc. I then called the Culligan folks and they looked up in my records what my iron content was when tested 2 years ago. I also snuck a well water sample in at pool store, and they tested for copper.

Based on the above tests, I don't need to treat my fill water. I guess I'm one of the lucky ones.

CaryB