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Moved from here. We have the same stain, at least noticed in Ski's photo. We used about 10# of ascorbic acid with the directions of TFP. Stain lighted, but then a pink color was noticed on the stain in the shallow end. Pinch a Penny gave us something to take the pink off and it worked, but still...

Followed ascorbic acid treatment for pool stain on floor and walls. First, CYA high, so did a partial drain, refill. Got the chlorine down to 0 and PH down. Ordered 1# of ascorbic acid (why we didn't order more, I don't know). Applied the 1# and also by TFP did the poly quat algaecide with 16oz...