I'm not sure you made any mistakes, though it sounds like you didn't complete the process, at least at first. There are 3 functional steps: re-dissolve the metal stains, treat them to keep the metals in the water and then EITHER remove the metals from the water (CuLator or calcium adsorption OR
We've gotten several reports of sequestrants clouding the pools they were used in. This result is not consistent with the old Dequest / Monsanto data I have on HEDP. I'm not sure if the problem is that the products are not HEDP, or if they have something in them besides HEDP, or if the Monsanto data is in error.
Can you tell me EXACTLY which sequestrant you used, and how much?
Also, have you identified what metal is staining your pool (sounds like iron) and where it's coming from? Have you done the bucket test on your incoming or fill water, to make sure that it's not contaminated with iron or something else?
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