Results of Ascorbic Acid Treatment for Stains

[JimK]

.....BUT, I know from my own experience that having calcium carbonate -- marble dust, plaster dust, or cal hypo residue -- DOES collect metal out of the water. Essentially, you end up staining the dust, instead of the pool.

.....

I wonder if that's where the metal in my pool went (recent bucket test revealed no metals). Up until this season (when I learned here only to shock when needed; ie cloudy, CC present, algae problem) I was "shocking" about every 2 weeks with cal hypo (2# of 68% each time). Each time the water would get cloudy, but clear by morning (I alway shock in the evening). Perhaps this was "grabbing" the metals so they could be filtered out?