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Less is more. Don't be adding minerals and chemicals with questionable benefits. Straight from the Pool School ABC's of pool chemistry you only need to worry about: Chlorine, CYA, Calcium (although less so in your vinyl pool) and balancing Ph. Not sure what's in "7-in-1" versus plain CalHypo...

Given how quickly it must have turned colors and the brightness and uniformity of the color, metal coloring would be my guess. Would a pool really turn that green from Algae overnight?

Nice pond they have there.

Very good points JV!

Interesting read over on phys.org referencing a study on pool/spa water and how disinfectant byproducts build up over time: Hot tubs and swimming pools are not as clean as you may think