In order for the metal magnet to sequester the copper, your chlorine levels have to stay fairly low--when you shock, it should cause the metals to fall out of suspension and possibly stain it worse. That being said....if your goal is just to get the pool open and deal with the stains later, then I would shock it, get all your chems where you want them, and THEN drop the chlorine level, add algaecide, and deal with the stains. If you do it the other way around and kill the stains first, then you're going to risk having them come back once you shock your water (and will delay opening that way, too). I highly suggest that you read through mbar's (Marie) stickies posted at the top of the metals forum--she's the resident expert on staining and I'm sure that she can help you through the process if you need it.
Janet
Bookmarks