Yellow Staining

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It’s not all over, but we have a number of spots in different areas on the bottom. And one of the curved walls looks yellow. But we aren’t really seeing rust, so maybe it’s not metals. I tried an algaecide, but not specifically for mustard algae. And there is an area on the liner above the water line (see photo). Do you think it’s probably mustard algae?
I appreciate the help. I know it’s tough to diagnose via photo!
Ask the Pool Guy Changed status to publish July 19, 2019

If the stainfree lifts the stain, then it is indeed metals – treat accordingly!

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Ask the Pool Guy Changed status to publish July 19, 2019

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