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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...

The pool has clouded up and I am trying to slowly bring up the chlorine. How long do I need to keep the pump on 24/7? It's been running non stop since I started the process on Thursday.

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...

Help please! I added 5 lbs of ascorbic acid throughout the day with little results on my stain. It is a large area and is possibly 3 years old. The ascorbic acid did streak the stain but it looks worse now. I have the pump running and will leave it overnight. Do I need to keep adding...