Got the pool with the house. 9K gal, AG, Vinyl, Sand, LP Heat, Well and don't know what I'm doing, but learning...and fast, lol. In the lower 48, SC, middle of state, come from Western NY, where the pool season is short. Pool store tells me I have copper in the water. I see that TF Test Kits sells a test kit for copper. I'm not sure why it matters if there is copper in the water or not. Maybe someone can help me out with this. I don't know if it's from the well water or the heater, or what I can do about it. I've got to think it's from the heater as they don't see it in the hot tub. Thanks for the warm welcome and I hope to learn a lot more real soon.