I have a 16' X 40' inground pool. I do not have a heater. I have a chlormatic II salt generator. The problem I have is that my salt cell stopped working and I purchased a new one to the tune of $700 and the rust staining started as soon as I turned it on with in just a few hours. I then returned to the dealer that I purchased it from and was told that the cell was working fine. I then bought ascorbic acid Vitiman C and added it to the pool which cleared up the staining immediately only to return the next day. I had my water tested and other than calcium being a little low water was fine, I had the pool tested for phosphates iron and copper all of which were all negative. I have treated the pool for staining 3 times now but staining continues to return, water even smells and taste like rust. The dealer said that the salt generator could not cause this problem. I have turned the generator off and ran just chlorine tablets for a week, I still get staining but not near as severe as with generator on. I was starting to get lite staining but when I turned the generator back on the deep staining returned almost immediately. I don't know what to do at this point can someone out there give me some ideas to try.