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Hi all, I have a pool at my home where I’ve been told the plaster was redone approximately 10 years ago. It needs a water change and it has some staining so I was researching my options and also discussing with a local pool servicer. This person said that I should not do an acid wash because it...

First thread here! See pics. I need help with my walls. I’m confused because the substance I’m trying to eliminate does sort of scrape off, but its extremely stubborn and there’s no way I can do it all by hand. It sort of seems to respond to Vitamin C but I’m not sure because it also seems to...