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    Help with rust looking stains

    Tried a quick search but this topic is so varied. I have rust looking stains appearing at the bottom of my plastered pool. Not on the walls, just the bottom in random places. I put some vitamin C tablets on one of the stains and it actually turned darker! I jumped in my cold pool and...
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    phosphates

    Interesting article I ran across on the net. http://www.mcgrayel.com/files/Phosphate ... _Myths.pdf Author concludes largest source of phosphates are from pool chemicals like algecides, scale and stain removers, not environmental (fertizlier or dirt blown into the pool).
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    Alkalinity Testing Inconsistency

    I recently stumbled across this site and love it. I have a 3 month old SWG gunnite pool. I'm not exactly sure what volume it is but based on some recent conditioner addition, I'm estimating its 20,000 gal. I've read all about the BBB method and I'm slowly moving my pool that direction...