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What are these small brown spots? I have had small brown specs appear on the rim of my tub for sometime. I just rub them away with a fingernail. I replaced my water a week ago, after they started to cover the inside of my tub. After 1 week, they are back! They are difficult to remove. I ended...

I am having real trouble lowering my phosphate levels, they are over 1000. My most recent readings are Total Hardness: <25ppm, pH: 7.2, TA: 100, CYA 50-100, Free Chlorine 1, Total Chlorine 1, Salt 1750, Phosphates 1000 (maybe higher?), and the water is slightly cloudy. I have a new Hot...