Good Morning, Chem Geek.
I'm happy to hear from you.
I actually have a sand filter and I've been using DE in it throughout this process and it does capture a decent amount of iron. The makeshift filter and the sand filter usually produces the same level of staining when we clean/backwash them (like this am, the staining in both was a lighter yellow/orange after filtering for 12 hours with a visibly crystal clear pool).
Yesterday at the pool store, my iron registered 0 - but clearly there was still iron in there as we cleaned both filters twice since my store testing and they were stained both times, so I'm not sure what kind of range their "0-reading" has (if that makes sense).
Right now I'm doing an ascorbic acid treatment (in the circulation phase until tomorrow am), at which point I'll be adding DE to the sand filter and putting the makeshift filter in as I slowly add chlorine (bleach). I imagine if staining returns during that process (esp since I haven't quite figured out what 'bringing it up slowly' means), that will tell me if I need to continue with sequestrants. I think on any level, though I certainly reduced the amount I'd need - no? It's just nice to see bottom for more than a day!
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