The "small amount of copper" comes from the Caribbean Clear system. I have had my pool for seven years now (built it myself). Never had any trouble with the pool chemistry, but I kept ruining clothes that were splashed with bleach from WalMart. 2 years ago I switched to a Salt Water Generator system....hated it. Ladder and slide started rusting, electricity bill went thru the roof among other issues. About the same time I noticed these spots starting to develop. I removed the system and went back to the old standby.... These white spots keep getting larger with every year and they are starting to look unsightly.
How can I tell if the spots are calcium, and what can be done about it?