Hello. I have opened my pool this year and cant seem to keep it from rusting. As previously stated I have used Sequa-Sol and I also have a 4ppm CuLator bag in my pump basket and 2 1ppm CuLator bags in my skimmer. My water was blue yet cloudy so I decided to shock it. I shocked it only 24hrs after I used Sequa-Sol. 4 hrs later rusty brown gross water. I took a water sample to pool store to have tested. All of my reading are fine and there is no trace of iron or copper in the water, which is the only metals they test for. I am currently at a loss for words and feel defeated. My local pool store is baffled and has no solutions for me. Any help would be deeply appreciated.