I'm going to start filling my newly put up pool, but I'm afraid that I'm going to stain the liner as the pool fills. My water is from a well and has issues with iron. I know because we have to clean our toilet often to prevent rings. I'm afraid that if I let the pool sit at certain levels as it fills, that I may end up with similar non-removable stains on the liner. Should I be worried, or should I just be able to brush it off. I figure once I fire up the sand filter, I'll be fine, but won't be able to run that until it's full. Thanks.