I've been through 2 cycles of this over the past month. I have metal stains on my vinyl liner, very uniform over the entire surface. I treat with Polyquat60. I dump 1 lb of Ascorbic Acid into the pool, the stains are lifted. I put a LOT of metal sequestration into the pool. I put a CuLator in the pump basket. The pool becomes cloudy for several days. I keep the PH at or lower than 7.2, I only add enough bleach to raise FC to 2 ppm. As the pool starts to clear, over the course of 1-2 weeks, the stains start working their way back onto the liner. And then I repeat the whole cycle again. I either have a clear pool with a tinged liner, or a blue pool with cloudy water. I can't win!
Can anyone give me advice to help break this cycle?