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Ascorbic Acid is a fast way to remove iron and cobalt stains from swimming pool and spa surfaces.
Bill’s Pools – 06/22/2016
I couldn’t believe how fast this product worked on my steps. It took the brown ugly stains off my steps on contact. I have a fiberglass pool and I tried this with the culator 1.0 to get rid of my problem. I’m very pleased. Thank you.
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