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I have a brownish stain on the bottom of my pool around the drain. I have tried the ascorbic acid treatment with little to no lifting. I tried the wet/dry sandpaper with no change. We tried scrubbing it with the chlorine puck which didn't work, however, leaving the puck for a few hours on the...

I have an old iron stain on the bottom of my pool near the drain. I have put 5 lbs of ascorbic acid on this over the last few days, but it is struggling to lift it. It has faded and there are streaks in the stain. Do I wait to put in the sequestering agent until the stain is completely gone...