My inground pool is about 15 years old with it's original vinyl liner. Recently, I have been noticing what appears to be rust stains, about the size of a dime, in the shallow part of the pool. Vigourous brushing with my vacuum brush fails to remove the spots. I would like some advice before attempting a cleaner which could be potentially damaging to the vinyl.
BTW. Any clue on the origin of these rust spots ????
Thank you for sharing your advice.