I filled a sock with a handful of Vitamin C tablets, about a tennis ball size, and whitened up the stairs and skimmer. They weren't even that badly stained. I've done that once or twice in the past, and never had an issue. Now my pool went from sparkling blue to having a green tint. I was not expecting that. Do I really have to go down metal sequestration rabbit holes for this? Or can I wait it out? The water is all new water company fill water from last year and was topped off maybe once or twice. I was expecting perhaps a slight hit to my chlorine, and indeed it dropped from 5 to 3 (already brought back up). This really should not have been some big dramatic event. ARGH!