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Grabbed some Vitamin C tablets and hopped in the pool. The large patches of reddish brown basically vaporized almost immediately, while the black spots were more stubborn. Not sure if the black responded to its acid or if having a hard tablet to scrape with did it...but some little spots of...

Shoot you are correct....I went to the wrong tab and didn't click on the SLAM tab for the proper chart. Quick update. I tested at 9pm, FC=9, CC=.5 Just tested the pool again at 10:30am, same results. No change granted the SWG is running at 85%. If it is metal stains....would the higher FC...

Hey Everyone, I know there are a lot of threads on this already...just looking to see what your thoughts are. At the beginning of July, I had metal stains on the floor of my vinyl liner (liner is old....8-12 years). Yes I plan to replace it. So I used a chlorine neutralizer and citric/ascorbic...