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I recognize I'm leaving "chemistry"; but I still am wondering if (extra) DE in the sand filter can help with metals. (I'm also wondering if my last post was so late at night it wasn't seen.) I've been to the TFP standard instructions for DE/Sand, which recommends a 1 psi rise in pressure. Is...

"Aeration raises pH, not lowers it." Yes, thank you, it's not the first, and won't be the last rookie mistake I make! "You don't want to use AA. It will turn everything black." Thanks. I was confused by this, since it seems to be such a common remedy. I'm sure you're right, based on how the AA...

As suggested, I tried dry acid in a sock, rubbing it on some pool stains. It did not turn black! The two stains I tried it on both lightened in tint. They did not completely disappear, but they are faint enough as to not be unsightly. So does this mean I should try an ascorbic acid treatment...

OK, I will try the dry acid in a sock tomorrow and post tomorrow night or Saturday. Thanks for the suggestion.

"more stains" hmm. :? OK, I'll not risk trying to create crystals. I appreciate the oxidation/pH explanation. Anyone have any success using metal-out (not sure brand names) hose filters (usually for fresh well-water)? And can they be used successfully by just recirculating from a submersible...

Thanks for the comments. Emptying pool and acid washing is not an option now. "There is no universally reliable method for removing metals from the water." ouch. Any advice for how high FC should be to hope for crystals? My tentative plan would be to load up DE into skimmer, raising the...

I’m a rookie, recent pool owner. My plaster turns not white, but black(!) when vitamin c tablets touch light brown-tinted stains (about 2 inch circle). I hit the internet, and I now understand conceptually “dissolve the metallic solids with Ascorbic Acid, then keep them suspended with...