I've about resigned myself to the fact that we will always have a yellow stained pool due to the iron content in our well water. After being a new pool owner for the past 3 years and knowing nothing about them going in, I believe I've mastered just about everything but this. I have tried all sorts of sequestering agents and products including CuLator but all to no avail. It always seems that no matter what I do, the minute I start to raise the chlorine level, the stains are back. Any suggestions? Has anyone else had any luck with treating iron stains and keeping them off the pool surface?