sequestering agent

Fiberglass pool, 8k gallons 2.2 FC 7.7 pH (too high) 87 CYA 118 TA 165 calcium hardness (low) It’s not any specific color but it is a bit darker than usual, especially at the deep end vs. the shallow steps. My best guess is metal accumulation from all the recent rain. Is that a reasonable...

We closed our pool last year with some iron stains on the vinyl liner surfaces. We identified the stains as iron by using Vitamin C tablets. It was too late in the season to bring the pool to 0 FC and then wait to SLAM for closing. So we closed the pool and just opened it back up. After doing a...

Hello TFPers, Can someone help me outright or point me to a guide on which Sequestering agent to use for which metal problem with respect to pool finish? I need to do an ascorbic acid treatment to get rid of some pale-brownish stains that are cropping up in my pool (confirmed not algae) and I...

I have an older fiberglass pool that was refinished 2 years ago. The sides of the pool are chalking. You rub your hand on the surface and a creamy white chalky material comes off on your hand. I have been told that it is do to low calcium and I’ve also been told you need to use a sequestering...