I would ditch the Frog. It adds copper to the water which you don't want. Copper is what turns hair green and can stain pools. How long have you been using it? If for very long, you might want to have a pool store test your water for metals before shocking the pool. Shocking can cause metals to fall out of suspension and stain things. If you do indeed have metal in there, you would need to use a metal sequestering product. We'll talk about that after you get the metals test done.

I'm going to ask Ben to look in on this thread. Sit tight for now. (But, if you can get the metals test done today, that would be another piece of information that you could have.)