hi. thanks for the reply. we have had a LOT of pollen and things blowing in from the trees lately, but the stains are not rubbing off. a vitamin c tablet, like a supplement pill? (sorry, pool newbie here!). re: metals, we did just add a few inches of water from the garden hose to bring the level up, and we have hard water locally. had planned to use Pool Magnet Plus after adding that, as the local pool store recommended it whenever adding water from the garden hose. is it possible that could remove it (if it's from metals)? i am taking a water sample to the pool store later this week to run full diagnostics, so i can reply back with accurate numbers at that point.