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Here is the ascorbic treatment: Take your chlorine down to 0 and PH down to 7.2, if there is chlorine in the water it won't hurt, it will just eat up the ascorbic acid, so you will need more to get rid of the stains. You can add poyquat 60 per directions on the bottle to avoid getting algae...

I've had several pools with various problems but this one has me baffled. Bought home in winter 2015. Above ground pool crystal clear when opened. August dark stains appear so I find TFP website and am very impressed. A vitamin C tablet dissolved it in an instant. Late in the season so I decided...