I used Chlor Brite and no mention of copper. I had my water tested again last night and CYA is still 40, FC is now 3. We ran the chlorine booster the other night to bring the chlorine level up. I bought 4 lbs of stabilizer last night and added half. Will add the other half this evening. Then, we'll see what happens. My water is not crystal clear yet like I was hoping. Do you think getting the stabilizer up will fix that? I will be ordering the K2006 test kit, but do you know if any local store in Northern VA would carry it so I can get it faster? I couldn't find any online.