jim249 Posted March 16, 2017 Report Share Posted March 16, 2017 I know this has been covered many times before. I have an in ground fiberglass spa that turns bright white after the water is emptied out and it dries. I circulated 5 pounds of citric acid through the pump system for two weeks and nothing. Next was 15% muriatic pool acid from HD applied full strength. Nothing. It did not fizz at all.This seems to be the kind of white that is like water spots on a window. When they are wet they disappear and after they dry out they turn white. Should I try the 31% muriatic acid from HD next? Running out of ideas now. Thanks for any help! Quote Link to comment Share on other sites More sharing options...
Patrick Doyle Posted March 20, 2017 Report Share Posted March 20, 2017 You obviously have a mineral build up of some kind. Your best source of an answer will be to contact Jacks Magic. They are the best in the industry to staining issues. www.jacksmagic.com Quote Link to comment Share on other sites More sharing options...
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