This happens to me when I use a lot of sequestering agent and raise the chlorine. It gets cloudy, sometimes milky. I just keep adding chlorine and keep the filter running 24/7 keeping the ph low. It takes a while to clear up, and you will have to vacuum a lot to get rid of the sediment that falls on the bottom of the pool. Once this is finished, you should not have as much of a problem with staining. Keep the faith