I really appreciate anyone who can help me with this.
We had the pool resurfaced last year. White plaster with blue aggregate. All was great until about 2 mos. ago when we thought we had mustard algae. We don't service the pool ourselves b/c it's so large (close to 50,000 gals.) and has a DE filter. I told the pool service co. that we had what appeared to be algae and I think he may have added some algaecide at that point. The stains did not go away. We brushed the entire pool. Still, the staining remained.
I contacted the pool contractor we used and they came out when I was not home and supposedly looked at it, and said it's not hydration but that the chlorine was too high and to tell the service co. to back off on the chlorine. I did that, and then we went on holiday so I did not see the pool for 3 weeks. There are 2 clean spots in the spa and the pool contractor says they used Jack's Magic #2 to spot treat the stains.
But we still have staining, and the service co. seems unable to figure out what to do. I have done some research and it would appear to be either copper or iron. No one here has blonde hair or I'd test it on them! The dog is white, maybe I should see if she'd turn green?
I rubbed half of a cut lemon on the stain and it did get lighter/go away. I am planning to fire the pool service company b/c the guy has not figured out how to get rid of the stains.
Please tell me what to do and how to do it. So far, it seems to require a buttload of Jack's Magic #2 and the Purple Stuff, which is going to cost me a small fortune, but the pool is huge and it can't be spot treated. I am trying to upload a photo but Windows keeps jamming.