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Hello everyone. I was initially posting about this in the algae threads but not getting many answers. I have some light staining on my vinyl liner which I suspect is iron. Vitamin C removes it instantly. After reading the absorbic acid stain removal steps on this site, , I have a few questions...

Hi everyone, I've been learning here for years first time posting! I'm in a serious battle with some brownish colored algae. Pools been open for 2 weeks now, water is clear and my tests are pretty much dialed in but can't shake this large spot on the shallow end floor. I even broke down went to...